A 145 m long train crosses a man walking at a speed of 9.5 km/h in the opposite direction in 30 seconds. What is the speed (in km/h) of the train ?
Given:
Length of train = 145 m
Speed of man = 9.5 km/h (opposite direction)
Time to cross = 30 seconds
Find: Speed of train (in km/h)
Formula Used:
Relative Speed = Distance / Time
Train Speed = Relative Speed − Man Speed (since opposite direction → relative = train + man)
145 m = 0.145 km
30 sec = = hour
Solution:
Relative Speed = 0.145 ÷ = 0.145 × 120 = 17.4 km/h
Train Speed = 17.4 - 9.5 = 7.9 km/h
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