Question

A train is 100m long crosses a 200m long n 20m wide bridge in 20 sec. what is the speed of the train in km/hr

Answer 1

Hi ,

Length of the train = 100 m

Length of the bridge = 200 m

Distance travelled to cross the

bridge = length of the train + length

of the bridge

d = 100m + 200m

= 300m

= 300 × ( 1/1000 )km

d = 3/10 km

Time taken to cross

the bridge = 20 sec

t = 20 × ( 1/3600 ) hr

t = ( 1/180 ) hr

Speed of the train = distance/time

S = ( 3/10 )/ ( 1/180 )

S = ( 3 × 180 )/10

S = 54 km/hr

Therefore ,

Speed of the train = 54 km/he

I hope this helps you.

: )