The speed of a boat in still water is 11 km/hr. It can go 12 km upstream and return downstream to the original point in 2 hours and 45 mins. Find the speed of the stream.
Answer:
if speed of the boat is x km/hr
then 12/(11-x) + 12/(11+x) = 2 (3/4)
x = 5 km/hr
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