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Q:

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 min. How long would it take to go from R to P?

  • 1
    $$3{3\over7}hr$$
  • 2
    $$7{4\over3}hr$$
  • 3
    $$6{2\over3}hr$$
  • 4
    $$7{1\over3}hr$$
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Answer : 4. "$$7{1\over3}hr$$"

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