The speed of a boat in still water in 15 km/hr and the speed of stream is 5 km/hr. The distance travelled downstream in 12 minutes is?

8 km 5 km 4.8 km 4 km

4 km

ATQ,        Downstream speed = 15 + 5 = 20 km/hr.                          Distance = speed x time                                       = 20 x \(\frac{12}{60}\) = 4 km.