For class 7
A man walks at a speed of 4km/h. A train coming from behind him at 22 km/h passes by him in 30 s. Find the length of the train.
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Step-by-step explanation:
Speed = 22km/hr - 4km/hr = 20km/hr = 20 × 1000/3600 = 5.56s
Time = 30s
Distance = Speed × Time = 5.56 × 30 = 166.8m
Hence the length of the train is 166.8m.
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