On a river , Q is the mid - point 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 minutes. How long would it take to go from R to P?
\({ \text{3}}\frac{3}{7}\) hr
5 hr
\({ \text{6}}\frac{2}{3}\) hr
\({ \text{7}}\frac{1}{3}\) hr
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