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?
Answer & explanation
Correct answer: option 1
We know that,
Upstream speed = Speed of boat - speed of stream
Downstream speed = Speed of boat + speed of stream
Given,
Upstream speed = 11 km/h
Downstream speed = 23 km/h
Let the speed of the canoe = x km/hr
and current = y km/hr
So, (x + y) = 23 ----(1)
(x – y) = 11 ----(2)
From equation (1) and equation (2)
x = 17 and y = 6.