Discussion of Question with ID = 030 under Distance-and-Time

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Question

Two trains start simultaneously. The first train moves from Jallandhar to Amritsar, whereas the second train moves from Amritsar to Jallandhar. After they meet at a point in between, they respectively take 100 hours and 36 hours to reach their destinations. What is the ratio of their speeds?

A

${3/5}$.

B

2.

C

${13/7}$.

D

${18/7}$.

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 $√36 : √100$, which gives 6 : 10, or ${3/5}$.


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