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A boat moves upstream at the rate of 1 km in 10 minutes and downstream at the rate of 1 km in 6 minutes. The speed of the current is?

1 km/hr
1.5 km/hr
2 km/hr
2.5 km/hr

Correct Answer: 2 km/hr

Explanation:

Speed upstream = 6 km/hr
Speed downstream = 10 km/hr
∴ Speed of the current = (10 - 6)/2 km/hr = 2 km/hr

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