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

EAMCET 2014
A

`5/3`

B

`5/6`

C

`1/3`

D

`14/3`

HINT

The total time taken will be the time taken in to go from home to market plus time taken to return home.
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