Question : A train completely crosses a bridge of length 80 m in 15 seconds. Find the length of the train if its speed is 72 km/hr.
Option 1: 300 metres
Option 2: 220 metres
Option 3: 150 metres
Option 4: 270 metres
Correct Answer: 220 metres
Solution :
Given: Length of bridge = 80 m
Time = 15 sec
Speed is 72 km/hr
= $72\times\frac{5}{18}$
= 20 m/sec
Let the length of the train be $x$ metres.
Distance = Speed × time = 20 × 15 = 300 metres
Length of train = Total distance – length of the bridge = 300 – 80 = 220 metres
Hence, the correct answer is 220 metres.
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