Q: A boat, whose speed in still water is 15 km/hr. goes 30 km in the downstream in 4.5 hours and returns in the upstream. Find the speed of the stream.
A.
4 km./hr.
B.
5 km./hr.
C.
10 km./hr.
D.
6 km./hr.
Correct Answer:
Option B -
Explanations:
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