Question

Question #2aebb

Answer 1

time taken = 79 seconds.

Explanation:

The train is moving with a constant velocity . And it should travel a bridge of `1km` in length which is equal to `1000m` and the train itself is `100m` .

So the total distance to be covered is `1000+100 m`= `1100m`= `1.1km`

with the velocity 50km/h.

A relation relating time taken, distance covered and the uniform velocity is given by,

`v=S/t`

where ,

v is the velocity,

S is the displacement (here it is total distance covered ),

and t is the time taken .

REARRANGING THE TERMS :

`t=S/v`

`t=(1.1 km)/(50 (km)/(h))`

`t=0.022 h`( 0.022 hours will be taken to cross the bridge)

Time in terms of seconds :

1 hour = 3600 seconds.

0.022 x 1 hour= 0.022 x 3600 seconds .

0.022 hours= 79.2 seconds .

So it will take 79 seconds to cross the bridge