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  1. A man rows downstream 60 km and upstream 36 km, taking 4 hours each time. The speed of the man is :
    1. 15 km/h
    2. 16 km/h
    3. 8 km/h
    4. 12 km/h
Correct Option: D

Sd = 15 km/h
Su = 9 km/h
Speed of man= (Sd + Su)/2
∴ Speed of man = (15 + 9)/ 2 = 12 km/h


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