Answers

2016-04-10T10:22:34+05:30
Speed of boat in still water = 9km/hr
Speed of boat downstream = 54 km / 4 hour = 13.5 km/hr
(Speed = Distance/time)

So, the speed of boat downstream will be the sum of the actual speed of boat and the speed of the stream
13.5 = 9 + Speed of the stream
Speed of the stream = 13.5 - 9 = 4.5 km/hr
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right answer
can you solve 2 more please
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