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A train 100 m long meets a man going in opposite direction at the speed of 5 km/hr and passes him in 7.2 seconds. At what rate is the train going?

Arun , 5 Years ago
Grade 12th pass
anser 1 Answers
Vikas TU

Last Activity: 5 Years ago

Hiii Arun 
The length of train= 100 meter
Velocity of man = 5 km/hr = 1.39m/s
Let velocity of train = v m/s 
so relative velocity = v+1.39 m/s 
100/7.2 = v+1.39
so v = 12.49 m/s 
v is aproximately equal to 45 km/hr
hope this help.

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