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A boy walks to his school at a distance...

A boy walks to his school at a distance of 6km with constant speed of 2.5 kmph and walks back with a constant speed of 4 kmph. His average speed for round trip expressed in kmph is

A

`24//13`

B

`40//13`

C

3

D

`1//2`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • A person walks along a straight road from his house to a marked 2.5kms away with a speed of 5 km/hr and instantly turns back and reaches his house with a speed of 7.5 kms/hr. The average speed of the person during the time interval 0 to 50 minutes is (in m/sec)

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    C
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