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  1. 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. 1 km/hr
    2. 1.5 km/hr
    3. 2 km/hr
    4. 2.5 km/hr
Correct Option: C

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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