Discussion of Question with ID = 010 under Distance-and-Time

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Question

Two trains start simultaneously. The first train moves from A to B, whereas the second train moves from B to A. After they meet at a point in between, they respectively take 144 hours and 49 hours to reach their destinations. What is the ratio of their speeds?

A

${7/12}$.

B

${19/11}$.

C

${31/14}$.

D

${43/14}$.

Soln.
Ans: a

If they take $t_1 and t_2$ hours respectively to reach their destinations, then the ratio of their speeds is $√t_2 : √t_1$. So we get $√49 : √144$, which gives 7 : 12, or ${7/12}$.


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