A boat moves downstream at the rate of one km in 5 minutes and upstream at the rate of 4 km an hour. What is the velocity of the current?
Speed downstream = $\dfrac{1}{\left(\dfrac{5}{60}\right)} = 12\text{ km/hr}$
Speed upstream $=\dfrac{4}{1}\text{ = 4 km/hr}$
velocity of the current $=\dfrac{1}{2}(12-4)= \text{4 km/hr}$
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