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A man can walk uphill at the rate of 2.5...

A man can walk uphill at the rate of 2.5 kmph and downhill at the rate of 3.25 kmph. If the total time required to walk a certain distance up the hill and return to the starting position is 4 hr 36 min, what is the distance he walked up the hill ?

A

`3.5 km `

B

`4.5 km`

C

`5.5 km`

D

`6.5 km`

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