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 2hrs 45 min. Find the speed of the stream.

Asked by Topperlearning User | 26th Jul, 2017, 12:54: PM

Expert Answer:

Let the speed of the stream = x km/hr

Speed of the boat in still water = 11 km/hr

Speed of the boat downstream = (11 + x) km/hr

Speed of the boat upstream = (11 - x) km/hr

According to the given information,

121 - x2 = 96

x2 = 25

x = 5

Rejecting negative value, as speed cannot be negative. So, x = 5.

Hence, the speed of the stream is 5 km/hr.

Answered by  | 26th Jul, 2017, 02:54: PM