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### Question

A train running at a speed of 19m/s crosses a pole in 18sec. How long will it take to cross a platform of length 684m?

**A**

54 sec.

**B**

55 sec.

**C**

53 sec.

**D**

56 sec.

**Soln.**

**Ans: a**

The length of the train can be obtained from the time it takes to cross the pole. The length of the train = $19 × 18$ = 342m. To cross the platform it must travel a total distance equal to the combined lengths of the train and the platform at this speed. So time = ${342 + 684}/19$ = 54 seconds.