A man walks on a straight road form his ...

A man walks on a straight road form his home to a market 2.5 km away with speed of 5 `(km)/(hr)`. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 `(km)/(hr)`. The average speed of the man over the intervel of time 0 to 40 min is equal to

`5 km//h`

`(25)/(4) km//h`

`(30)/(4)km//h`

`(45)/(8) km//h`

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