It takes 15 hours for a boat to reach its destination and return to itis initial place if the river has no flow.
For the same journey it requires 16 hours if the river is flowing. The difference between the speeds of boat and river is 15 kmph. Find the speed of the river?
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Time taken in downstream =
15+5
d
=
20
d
Time taken in upstream =
15−5
d
=
10
d
∴ Average speed =
20
d
+
10
d
2d
=
3
40
km/hr
So,
Speed in still water
Average speed
=
15
40/3
=
45
40
=
9
8
.
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