The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 24 minutes is
3.6 km
2.4 km
3.2 km
7.2 km
Explanation:
speed of a boat in still water = 15 km/hr
Speed of the current = 3 km/hr
Speed downstream = (15+3) = 18 km/hr
Distance travelled downstream in 24 minutes $=\dfrac{24}{60} \times 18 = \dfrac{2 \times 18}{5}\text{ = 7.2 km}$