The speed of a boat in still water in 22 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 24 minutes is:
Speed downstream = (22 + 4) = 26 kmph
Time = 24 minutes $=\dfrac{24}{60}\text{ hour = }\dfrac{2}{5}\text{ hour}$
Distance travelled = Time × speed $=\dfrac{2}{5} \times 26$ = 10.4 km
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