Question

A train 100 m long is to cross a river bridege of length 800 m. What time will it take to cross the bridge. Given that trains velocity is 36 km /h

Answer 1

Answer:

total length =900m

change into m/s= 36 ×5/18=10m/s

so, time= distance /speed

=900/10 = 90sec.

answer is 1minute 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.