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On a river, Q is the mid-points P and R ...

On a river, Q is the mid-points P and R on the same bank of the river. A boat can go from P to Q and back in 12 hours, and from P to R in 16 hours 40 min. How long would it take to go from R to P?

A

`3(1)/(3)` hr.

B

5 hr.

C

`6(2)/(3)` hr.

D

`7(1)/(3)` hr.

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