A man takes 20 minutes to row 12 km upstream which is a third more than the time he takes on his way downstream. What is his speed in still water?
A. 41 km/hr
B. 36 km/hr
C. 42 km/hr
D. 45 km/hr
Plz give me a full explanation step by step
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Note: y is just a random variable which would satisfy the value of x at the end of the answer.
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