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### Question

A train running at a speed of 18m/s crosses a pole in 16sec. How long will it take to cross a platform of length 864m?

**A**

64 sec.

**B**

65 sec.

**C**

63 sec.

**D**

66 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 = $18 × 16$ = 288m. 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 = ${288 + 864}/18$ = 64 seconds.