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  1. A boat moves downstream at 1 km in 5 minutes and upstream at 1 km in 12 minutes.What is the speed of current?
    1. 4.5 km/h
    2. 3.5 km/h
    3. 2 km/h
    4. 2.5 km/h
Correct Option: B

Sd = 12 km/h
Su = 5 km/h
Speed of current = (12 - 5)/2 = 3.5 km/h


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