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0. A motorboat covers a given distance in 6 hours movingdownstream on a river. It covers the same distance in10 hours moving upstream. The time it takes to coverthe same distance in still water is(a) 9 hours(b) 7.5 hours(c) 6.5 hours(d) 8 hours |
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Answer» Answer: b) 7.5 hours Explanation: LET velocity in STILL water be S Velocity of water be W Distance to be covered be D D=6(S+W) D=10(S−W) which gives S=4W So, D=7.5hrs. |
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