On a river, Q is the midpoint between tw...

On a river, Q is the midpoint between two 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 ?

`3(3)/(7)`h

`6(2)/(3)`h

`7(1)/(3)`h

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