Question

A train 225m long,travels at a uniform speed of 54 km/hr.How much time will it take to pass:
i)a telegraph post?
ii)a platform 150m long?
iii)a bridge 105m long?

Answer 1

(1). Time taken by train in passing a telegraph post(T₁) = (Length of train)÷(Speed of train)
Speed(v) = 54 km/h = 54×5/18 = 15 m/s
T₁ = 225/15 = 15 seconds

(2). Time taken by train to passing a 150 m long platform(T₂) = (Length of the train + Length oh platform)÷(speed)
T₂ = (225+150)÷(15) = 375/15 = 25 seconds

(3). Similarly Time taken by the train to cross a bridge(T₃) = (225+105)/15
T₂ = 330/15 =22 seconds