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Question 86
The speeds of a boat downstream and upstream are 18 km/hr and 8 km/hr respectively. What is the speed of the stream?
Solution
Let the speed of the boat in still water be ‘u’.
Let the speed of the stream be ‘v’.
The speed of the boat upstream = u-v
The speed of the boat downstream = u+v
It is given that,
u-v = 8 and u+v = 18
Solving them we get, u = 13 and v = 5.
Thus the speed of the stream is 5 km/hr.
Hence the answer to this question is Option D.
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