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Category: Logic

A-distance-of-200-km-is-to-be-covered-by-car-in-less-than-10-hours-Yash-does-it-in-two-parts-He-first-drives-for-150-km-at-an-average-speed-of-36-km-hr-without-stopping-After-taking-rest-for-30-mi

Question Number 16942 by Tinkutara last updated on 28/Jun/17 $$\mathrm{A}\:\mathrm{distance}\:\mathrm{of}\:\mathrm{200}\:\mathrm{km}\:\mathrm{is}\:\mathrm{to}\:\mathrm{be}\:\mathrm{covered}\:\mathrm{by} \\ $$$$\mathrm{car}\:\mathrm{in}\:\mathrm{less}\:\mathrm{than}\:\mathrm{10}\:\mathrm{hours}.\:\mathrm{Yash}\:\mathrm{does}\:\mathrm{it} \\ $$$$\mathrm{in}\:\mathrm{two}\:\mathrm{parts}.\:\mathrm{He}\:\mathrm{first}\:\mathrm{drives}\:\mathrm{for}\:\mathrm{150}\:\mathrm{km} \\ $$$$\mathrm{at}\:\mathrm{an}\:\mathrm{average}\:\mathrm{speed}\:\mathrm{of}\:\mathrm{36}\:\mathrm{km}/\mathrm{hr}, \\ $$$$\mathrm{without}\:\mathrm{stopping}.\:\mathrm{After}\:\mathrm{taking}\:\mathrm{rest}\:\mathrm{for} \\ $$$$\mathrm{30}\:\mathrm{minutes},\:\mathrm{he}\:\mathrm{starts}\:\mathrm{again}\:\mathrm{and}\:\mathrm{covers} \\ $$$$\mathrm{the}\:\mathrm{remaining}\:\mathrm{distance}\:\mathrm{non}-\mathrm{stop}.\:\mathrm{His} \\ $$$$\mathrm{average}\:\mathrm{for}\:\mathrm{the}\:\mathrm{entire}\:\mathrm{journey} \\…

The-Object-shown-in-the-diagram-is-made-by-gluing-together-the-adjacent-faces-of-six-wooden-cubes-each-having-edges-of-length-2-cm-Find-the-total-surface-area-of-the-object-in-square-centimetres-

Question Number 16938 by Tinkutara last updated on 28/Jun/17 $$\mathrm{The}\:\mathrm{Object}\:\mathrm{shown}\:\mathrm{in}\:\mathrm{the}\:\mathrm{diagram}\:\mathrm{is} \\ $$$$\mathrm{made}\:\mathrm{by}\:\mathrm{gluing}\:\mathrm{together}\:\mathrm{the}\:\mathrm{adjacent} \\ $$$$\mathrm{faces}\:\mathrm{of}\:\mathrm{six}\:\mathrm{wooden}\:\mathrm{cubes},\:\mathrm{each}\:\mathrm{having} \\ $$$$\mathrm{edges}\:\mathrm{of}\:\mathrm{length}\:\mathrm{2}\:\mathrm{cm}.\:\mathrm{Find}\:\mathrm{the}\:\mathrm{total} \\ $$$$\mathrm{surface}\:\mathrm{area}\:\mathrm{of}\:\mathrm{the}\:\mathrm{object}\:\mathrm{in}\:\mathrm{square} \\ $$$$\mathrm{centimetres}. \\ $$ Commented by Tinkutara…

In-the-diagram-it-is-possible-to-travel-only-along-an-edge-in-the-direction-indicated-by-the-arrow-How-many-different-routes-from-A-to-B-are-there-in-all-

Question Number 16936 by Tinkutara last updated on 28/Jun/17 $$\mathrm{In}\:\mathrm{the}\:\mathrm{diagram},\:\mathrm{it}\:\mathrm{is}\:\mathrm{possible}\:\mathrm{to}\:\mathrm{travel} \\ $$$$\mathrm{only}\:\mathrm{along}\:\mathrm{an}\:\mathrm{edge}\:\mathrm{in}\:\mathrm{the}\:\mathrm{direction} \\ $$$$\mathrm{indicated}\:\mathrm{by}\:\mathrm{the}\:\mathrm{arrow}.\:\mathrm{How}\:\mathrm{many} \\ $$$$\mathrm{different}\:\mathrm{routes}\:\mathrm{from}\:\mathrm{A}\:\mathrm{to}\:\mathrm{B}\:\mathrm{are}\:\mathrm{there} \\ $$$$\mathrm{in}\:\mathrm{all}? \\ $$ Commented by Tinkutara last updated…

Find-distinct-natural-numbers-from-1-to-9-such-that-these-six-equations-are-satisfied-simultaneously-1-a-bc-20-2-d-e-f-20-3-g-hi-20-4-adg-20-5-b-eh-20-6-c-f-i-1

Question Number 16701 by Tinkutara last updated on 25/Jun/17 $$\mathrm{Find}\:\mathrm{distinct}\:\mathrm{natural}\:\mathrm{numbers}\:\mathrm{from}\:\mathrm{1} \\ $$$$\mathrm{to}\:\mathrm{9}\:\mathrm{such}\:\mathrm{that}\:\mathrm{these}\:\mathrm{six}\:\mathrm{equations}\:\mathrm{are} \\ $$$$\mathrm{satisfied}\:\mathrm{simultaneously}: \\ $$$$\left(\mathrm{1}\right)\:{a}\:+\:{bc}\:=\:\mathrm{20} \\ $$$$\left(\mathrm{2}\right)\:{d}\:+\:{e}\:+\:{f}\:=\:\mathrm{20} \\ $$$$\left(\mathrm{3}\right)\:{g}\:−\:{hi}\:=\:−\mathrm{20} \\ $$$$\left(\mathrm{4}\right)\:{adg}\:=\:\mathrm{20} \\ $$$$\left(\mathrm{5}\right)\:{b}\:+\:{eh}\:=\:\mathrm{20} \\…

If-z-x-jy-where-x-and-y-are-real-show-that-the-locus-z-2-z-1-2-is-a-circle-and-determine-its-centre-and-radius-

Question Number 15201 by tawa tawa last updated on 08/Jun/17 $$\mathrm{If}\:\:\mathrm{z}\:=\:\mathrm{x}\:+\:\mathrm{jy}\:,\:\mathrm{where}\:\mathrm{x}\:\mathrm{and}\:\mathrm{y}\:\mathrm{are}\:\mathrm{real},\:\mathrm{show}\:\mathrm{that}\:\mathrm{the}\:\mathrm{locus}\:\:\mid\frac{\mathrm{z}\:−\:\mathrm{2}}{\mathrm{z}\:+\:\mathrm{1}}\mid\:=\:\mathrm{2}\:\:\mathrm{is}\:\mathrm{a}\:\mathrm{circle} \\ $$$$\mathrm{and}\:\mathrm{determine}\:\mathrm{its}\:\mathrm{centre}\:\mathrm{and}\:\mathrm{radius}. \\ $$ Terms of Service Privacy Policy Contact: info@tinkutara.com

Question-145282

Question Number 145282 by puissant last updated on 03/Jul/21 Answered by Olaf_Thorendsen last updated on 03/Jul/21 $${t}\:\mathrm{est}\:\mathrm{le}\:\mathrm{temps}\:\mathrm{en}\:\mathrm{heures}. \\ $$$$\mathrm{Angle}\:\mathrm{parcouru}\:\mathrm{par}\:\mathrm{la} \\ $$$$\mathrm{petite}\:\mathrm{aiguille}\:: \\ $$$$\theta_{{p}} \left({t}\right)\:=\:\frac{\mathrm{2}\pi}{\mathrm{12}}\left({t}−\mathrm{12}\right)\:=\:\frac{\pi}{\mathrm{6}}\left({t}−\mathrm{12}\right) \\…

Question-13988

Question Number 13988 by kunalshukla95040 last updated on 26/May/17 Commented by mrW1 last updated on 26/May/17 $${voltage}\:{is}\:{always}\:{between}\:\mathrm{2}\:{points}. \\ $$$${so}\:{there}\:{is}\:{no}\:{voltage}\:{in}\:{a}\:{point}\:. \\ $$$$ \\ $$$${to}\:{have}\:{an}\:{answer}\:{you}\:{have}\:{to}\:{specify} \\ $$$${the}\:{other}\:{point}.…

Let-n-be-an-odd-positive-integer-On-some-field-n-gunmen-are-placed-such-that-all-pairwise-distances-between-them-are-different-At-a-signal-every-gunman-takes-out-his-gun-and-shoots-the-closest-gun

Question Number 13893 by Tinkutara last updated on 24/May/17 $$\mathrm{Let}\:{n}\:\mathrm{be}\:\mathrm{an}\:\mathrm{odd}\:\mathrm{positive}\:\mathrm{integer}.\:\mathrm{On} \\ $$$$\mathrm{some}\:\mathrm{field},\:{n}\:\mathrm{gunmen}\:\mathrm{are}\:\mathrm{placed}\:\mathrm{such} \\ $$$$\mathrm{that}\:\mathrm{all}\:\mathrm{pairwise}\:\mathrm{distances}\:\mathrm{between} \\ $$$$\mathrm{them}\:\mathrm{are}\:\mathrm{different}.\:\mathrm{At}\:\mathrm{a}\:\mathrm{signal},\:\mathrm{every} \\ $$$$\mathrm{gunman}\:\mathrm{takes}\:\mathrm{out}\:\mathrm{his}\:\mathrm{gun}\:\mathrm{and}\:\mathrm{shoots} \\ $$$$\mathrm{the}\:\mathrm{closest}\:\mathrm{gunman}.\:\mathrm{Prove}\:\mathrm{that}: \\ $$$$\left(\mathrm{a}\right)\:\mathrm{at}\:\mathrm{least}\:\mathrm{one}\:\mathrm{gunman}\:\mathrm{survives}; \\ $$$$\left(\mathrm{b}\right)\:\mathrm{no}\:\mathrm{gunman}\:\mathrm{is}\:\mathrm{shot}\:\mathrm{more}\:\mathrm{than}\:\mathrm{5} \\…