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### Question

A train is running at a speed of 82km/h. If it takes 36sec to move past a telegraph pole, then what is its length?

**A**

820 meters.

**B**

821 meters.

**C**

819 meters.

**D**

822 meters.

**Soln.**

**Ans: a**

The total distance to be covered is equal to the length of the train. By the time and distance formula, we get length = time × speed × (5/18), which gives $36 × 82 × (5/18)$ = 820m. Please note that 5/18 is the conversion from km/h to m/s.