Question

A 200m long train crosses a 400m bridge with
a velocity of 36km/h Find the time taken by the
train to cross the bridge.​

Answer 1

Answer:

the time taken will be 1 minute.

Explanation:

as first the engine of train enters and then the whole train passes and finally the last point in the train crosses the bridge.  

So, total distance covered by the train = Length of bridge + it's own length

=> (200+400)m

=> 600 m.  

Speed = 36 kmph = 10m/s  

Hence, time taken = 600/10 s = 60s = 1min

Answer 2

s=400+200m=600m

v=36km/h=36×1000/3600=10m/s

so t=s/v=600/10=60s=1min

Explanation:

so here u have to consider length of train and length of bridge.so basically we use relative distance here. and keep in your mind about km/h and all conversions to get right answer