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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 ${3/5}$.