Question

A person starting from his house covers a distance at 15kmph and return to the starting point at 10kmph. His average speed during the whole journey is

Answer 1

Average speed = ( 2xy ) / ( x + y )

= ( 2 x 15 x 10 ) / ( 15 + 10)

=> 12 k / hr.

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Answer 2

first his speed is 15kmph and then 10kmph so his average speed is 12 and half kmph