he effective speed of a boat is 15.6 km/h against the stream and 20.4 km/h along the stream. Find the speed of the stream
Question
The effective speed of a boat is 15.6 km/h against the stream and 20.4 km/h along the stream. Find the speed of the stream.
Solution
To find the speed of the stream, we need to use the given speeds of the boat against and along the stream.
The effective speed of the boat against the stream is the speed of the boat minus the speed of the stream. Let's denote the speed of the boat as 'b' and the speed of the stream as 's'. So, we have:
b - s = 15.6 ...(equation 1)
The effective speed of the boat along the stream is the speed of the boat plus the speed of the stream. So, we have:
b + s = 20.4 ...(equation 2)
To find the speed of the stream 's', we can subtract equation 1 from equation 2:
(b + s) - (b - s) = 20.4 - 15.6 2s = 4.8
So, the speed of the stream 's' is 4.8 / 2 = 2.4 km/h.
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