Question

0. A motorboat covers a given distance in 6 hours moving
downstream on a river. It covers the same distance in
10 hours moving upstream. The time it takes to cover
the same distance in still water is
(a) 9 hours
(b) 7.5 hours
(c) 6.5 hours
(d) 8 hours
​

Answer 1

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.

Answer 2

Answer:

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