The speed of a boat in still water is . It can go upstream and return downstream to the original point in hrs min. Find the speed of the stream.
Determining the speed of the stream
Let the speed of the stream be .
Given that the speed of the boat in still water is .
Thus, the upstream speed of the boat will become and the downstream speed will become .
The total time taken to go upstream and return to the original point downstream is hrs min, i.e. minutes.
As per the given condition,
Since the speed of the stream cannot be negative,
Therefore, the speed of the stream is .