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A particle covers 1/4th of the total distance at a speed of 20 km/hr, 1/2 of the total distance at a speed of 40 km/hr, 1/6th of the total distance at a speed of 10 km/hr and remaining 1/12th of the distance at a speed of 30 km/hr. What is the average speed in km/hr?
detailed solution
Correct option is A
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A boy walks to his school at a distance of 6 km with constant speed of 2.5 km/h and walks back with a constant speed of 4 km/h. His average speed for the round trip is
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