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### Question

Two trains start simultaneously. The first train moves from Jammu to Tawi, whereas the second train moves from Tawi to Jammu. After they meet at a point in between, they respectively take 4 hours and 9 hours to reach their destinations. What is the ratio of their speeds?

**A**

${3/2}$.

**B**

${5/2}$.

**C**

${7/2}$.

**D**

${9/4}$.

**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 $√9 : √4$, which gives 3 : 2, or ${3/2}$.