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A person rows a kilometre down the stream in 10 minute and upstream in 30 minutes. Find the velocity of the stream?

1 km/hr
2 km/hr
3 km/hr
4 km/hr

Correct Answer: 2 km/hr

Explanation:

Velocity of stream = (downstream velocity - upstream velocity)/2
= (60/10 - 60/30)/2
= 2 km/hr

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