Question

A train 100m long is moving with a velocity of 60 km/hr. The time it takes to cross the bridge 1km long is ?

Answer 1

60km/hr=60000m/hr
Amt. of time the front part of the train takes to cross the bridge=Distance/Speed
=1km.hr/60km
=1/60hr
=1/60×60 min
=1 min=60 secs
Extra time taken for the end part of the train to cross the bridge=100m.hr/60000 m
=1/600 hr
=1/600×3600 secs
=6 secs
Total time taken=60 secs+6 secs
=1 min 6 secs(Ans.)