Question

A 200 mt long train crosses a 400 mt long bridge with a velocity of 36 kmph find the time taken by train to cross the bridge

Answer 1

Time = Distance / Speed
= (200 + 400) / (36 * 5/18)
= 600 / 10
= 60 seconds
= 1 minute

Time taken by train to cross the bridge is 1 minute
[Note: I converted 36kmph to m/s by multiplying it by 5/18]

Answer 2

Hi !

Distance = 200 + 400 = 600 m
Speed = 36 km/hr = 36 x 5/18 = 10 m/s

Time = t = ?

t = Distance/speed
  = 600/10
  = 60 sec
  = 1 min

Time taken  by train to cross the bridge = 1 min