Question

a train 100m long is to cross a river bridge of length 800m . What time will it take to cross the bridge, if train is moving with constant velocity of 36km/hr​

Answer 1

Answer:

total length= 900m

change into m/s=36×5/18=10m/s

time= distance/speed

900/10= 90 sec.

so answer is 1 minute and 30 seconds

Answer 2

Total distance required for the train to cross the bridge is,

d = (100 + 800) m = 900 m

The speed of the train is,

v = 36 km/h = (36 × 5 / 18) = 10 m/s

Hence the time taken to cross the bridge is,

t = 900 / 10 = 90 s.