Question 51

In one hour, a man rows his canoe against the stream at 11 km/h and along the stream at 23 km/h. What is the speed (in km/h) of the stream?

Solution

Let's assume the speed of the canoe in still water is 'B'.

The speed of the stream is 'C'.

A man rows his canoe against the stream at 11 km/h and along the stream at 23 km/h.

B-C = 11 Eq.(i)

B+C = 23 Eq.(ii)

2B = 11+23 = 34

B = 17

Put the value of 'B' in Eq.(i).

17-C = 11

C = 17-11

Speed of the stream = C = 6 km/h

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