The speed of a boat in still water is 12 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 18 minutes is  Choose the correct answer:
A) 1.6 km B) 2 km C) 3.6 km D) 4.8 km E) None of these
Explanation:   Speed downstreams	=(12 + 4)= 
<gadget id="calculator">(12 + 4)</gadget>
<output>16</output>
16 kmph.   4.8 kmistance travelled= (16 x 18/60)km   = 4.8km   Option 4.8 km
<result>D</result>
The speed of a boat in still water is 12 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 18 minutes is