Question

A 60 m long train moving with constant velocity on a straight level track passes a pole in 5s. The time it will take to cross a 540 m long bridge is .

• A. 50s
• B. 40s
• C. 30s

Answer 1

The correct option is A 50s

Speed of the train $=\frac{\text{Length of the train}}{\text{Time taken to cross the pole}}$
$=\frac{60}{5}m/s=12m/s$

Now, distance to be covered to cross a 540 m long bridge:
=Length of the train + Length of the bridge
= 60 m + 540 m = 600 m

Hence time taken $=\frac{\text{distance}}{\text{speed}}$
= $\frac{600}{12}$ s = 50 s