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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 4 hours to reach their destinations. What is the ratio of their speeds?

**A**

${1/6}$.

**B**

${7/5}$.

**C**

${13/8}$.

**D**

${19/8}$.

**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 $√4 : √144$, which gives 2 : 12, or ${1/6}$.