A boatman can row a boat downstream and upstream at 13 kmph and 9 kmph respectively. What will be the speed of boat in still water? (in kmph) - Quantitative Aptitude MCQ WBCS Prelims 2021 2026 | ExamTest.live

mediumMCQWBCS Prelims 20212026Quantitative Aptitude

1 mark

A boatman can row a boat downstream and upstream at 13 kmph and 9 kmph respectively. What will be the speed of boat in still water? (in kmph)

Solution & Step-by-step Explanation

Let the downstream speed be v_{down} = 13 kmph and the upstream speed be v_{up} = 9 kmph . The formula for the speed of a boat in still water is: Speed in still water = \frac{v _{down} + v _{up}}{2} Substituting the given values: Speed in still water = \frac{13 + 9}{2} = \frac{22}{2} = 11 kmph

Try it yourself before checking the explanation above.

A boatman can row a boat downstream and upstream at 13 kmph and 9 kmph respectively. What will be the speed of boat in still water? (in kmph)

12

10.5

11

10

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