A train 300 m long is running with a speed of 54 km/hr. In what time it cross a telephone pole ?

A. 20 seconds

B. 15 seconds

C. 17 seconds

D. 18 seconds

Answer: Option A

Solution(By Examveda Team)

Here length of pole is considered 0 metre
Time will be taken by train to cross the poll :
$$\eqalign{ & = \frac{{{\text{300 m}}}}{{54 \times \frac{5}{{18}}{\text{ m/s}}}} \cr & = \frac{{300}}{{15}} \cr & = 20 \cr} $$
Required time = 20 seconds