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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​

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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