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Boats & Streams

A boat takes ...

Question

A boat takes 7 hours to go from P to R, through a midpoint Q, but it takes 8 hours to go from P to Q and then return from Q to P. How long it would take to go from R to P?

7 h

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8 h

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9 h

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None of these

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Solution

The correct option is C 9 h

It means P $\to$ Q (3.5 h)
Again {P $\to$ Q and Q $\to$ P} (8 h)
It means Q $\to$ P(4.5 h)
Therefore R $\to$ Q (4.5 h)
Thus, from R to P boat wil take 9 hours.

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A boat takes 7 hours to go from P to R, through a midpoint Q, but it takes 8 hours to go from P to Q and then return from Q to P. How long it would take to go from R to P?

The correct option is C 9 h It means P → Q (3.5 h) Again {P → Q and Q → P} (8 h) It means Q → P(4.5 h) Therefore R → Q (4.5 h) Thus, from R to P boat wil take 9 hours.

The correct option is C 9 h

It means P $\to$ Q (3.5 h)
Again {P $\to$ Q and Q $\to$ P} (8 h)
It means Q $\to$ P(4.5 h)
Therefore R $\to$ Q (4.5 h)
Thus, from R to P boat wil take 9 hours.