A train of length 50 m is moving with a constant speed of 10m/s. Calculate the time taken by the train to cross an electric pole and a bridge of length 250 m. (5s, 30s).

Explanation

Length of the train 50 m., Speed of the train v = 10 m/s.
Distance travelled while crossing an electric pole = Length of the train = s = 50m.
`therefore` Time taken to cross the electric pole 't' = `s/vrArrt=50/10=5s.`
Length of the bridge = 250 m.
Distance travelled while crossing the bridge = Length of train + Length of bridge
= 50 + 250 = 300m.
`therefore` Time taken to cross the bridge = `(300m)/(10m//s)=30sec`.