Menu Close

The-speeds-of-Daniel-and-Robert-are-in-the-ratio-of-3-4-In-a-race-of-300m-Daniel-has-a-start-of-90m-Daniel-won-by-




Question Number 18214 by chux last updated on 16/Jul/17
The speeds of Daniel and Robert  are in the ratio of 3:4.In a race of  300m Daniel has a start of 90m.   Daniel won by?
$$\mathrm{The}\:\mathrm{speeds}\:\mathrm{of}\:\mathrm{Daniel}\:\mathrm{and}\:\mathrm{Robert} \\ $$$$\mathrm{are}\:\mathrm{in}\:\mathrm{the}\:\mathrm{ratio}\:\mathrm{of}\:\mathrm{3}:\mathrm{4}.\mathrm{In}\:\mathrm{a}\:\mathrm{race}\:\mathrm{of} \\ $$$$\mathrm{300m}\:\mathrm{Daniel}\:\mathrm{has}\:\mathrm{a}\:\mathrm{start}\:\mathrm{of}\:\mathrm{90m}.\: \\ $$$$\mathrm{Daniel}\:\mathrm{won}\:\mathrm{by}? \\ $$
Answered by ajfour last updated on 17/Jul/17
300=3ut+90   ⇒  ut=70m  300−4ut=300−280=20m.
$$\mathrm{300}=\mathrm{3ut}+\mathrm{90}\:\:\:\Rightarrow\:\:\mathrm{ut}=\mathrm{70m} \\ $$$$\mathrm{300}−\mathrm{4ut}=\mathrm{300}−\mathrm{280}=\mathrm{20m}. \\ $$

Leave a Reply

Your email address will not be published. Required fields are marked *