A man walks at the speed of 4 km/hr. A train coming from behind here at 22 km/hr passes by him in 30 sec. The length of the train is ____m.

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Detailed Solution

Concept- The length of the train is 150.
The definition of relative speed is the speed of one moving item in relation to another. Relative speed is calculated as the difference between two moving objects while they are traveling in the same direction. Additionally, relative speed is calculated by summing the two speeds when the two objects are moving in the opposite directions. Simply determining the train's relative speed to the man in the question and using the method for calculating distance vs time will allow us to determine the length of the train that is necessary.
Speed of

Speed of train

Relative speed of train w.r.t man

Length of train

Hence, the correct option is 150m.

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