1. Speed of a man is 10 km/h in still water. If the rate of current is 3 km/h, then the effective speed of the man upstream is:

Answer: 7 km/h Sol. Speed of man in still water = 10 km/h Speed of current = 3 km/h ∴ Speed of man upstream = 10 – 3 = 7 km/h

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