Question 118
The speed of a boat in still water is 5 km/hr. If it takes thrice as much time to go 20 km upstream as to go the same distance downstream, find the speed of the stream.
Solution
Let the speed of stream be 's' km/hr.
$$\ \frac{\ 20}{5-s}=\ 3\times\frac{20}{5+s}$$
5+s=15-3s
s=2.5km/hr
Option B is the answer.
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