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A man rows downstream 60 km and upstream 36 km, taking 4 hours each time. The speed of the man is :

15 km/h
16 km/h
8 km/h
12 km/h

Correct Answer: 12 km/h

Explanation:

S_d = 15 km/h
S_u = 9 km/h
Speed of man= (S_d + S_u)/2
∴ Speed of man = (15 + 9)/ 2 = 12 km/h

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