Question Number 171153 by Mastermind last updated on 08/Jun/22
$${An}\:{aeroplane}\:{covers}\:{a}\:{certain}\:{distance} \\ $$$${at}\:{a}\:{speed}\:{of}\:\mathrm{240}{kmph}\:{in}\:\mathrm{5}\:{hours}. \\ $$$${to}\:{cover}\:{the}\:{same}\:{distance}\:{in}\:\mathrm{1}\frac{\mathrm{2}}{\mathrm{3}}\:{hrs}, \\ $$$${it}\:{must}\:{travel}\:{at}\:{a}\:{speed}\:{of}: \\ $$$$\left.{A}\right)\:\mathrm{300}{kmph} \\ $$$$\left.{B}\right)\:\mathrm{360}{kmph} \\ $$$$\left.{C}\right)\:\mathrm{600}{kmph} \\ $$$$\left.{D}\right)\:\mathrm{700}{kmph} \\ $$$$ \\ $$$${Mastermind} \\ $$
Answered by Rasheed.Sindhi last updated on 08/Jun/22
$$\mathcal{T}{otal}\:{distance}\:{covered}\:{in}\:\mathrm{5}\:{hours} \\ $$$${with}\:{spped}\:\mathrm{240}\:{kmph} \\ $$$$=\mathrm{240}×\mathrm{5}=\mathrm{1200}{km} \\ $$$$\:\:\:\:\overline {{v}}=\frac{\mathrm{1200}}{\mathrm{1}\frac{\mathrm{2}}{\mathrm{3}}}=\mathrm{1200}×\frac{\mathrm{3}}{\mathrm{5}}=\mathrm{720}{kmph} \\ $$