The speed of a boat in still water in 20 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 24 minutes is:  Choose the correct answer.
A) 9.2	B) 10.2	C) 9.8	D) 9.6	E) 10.0
Speed downstream = (20 + 4)= 
<gadget id="calculator">(20 + 4)</gadget>
<output>24</output>
24 kmph   Time= 24 minutes =24/60 hour = 2/5 hour   9.6istance travelled = Time × speed =2/5×24 = 9.6 km   Answer is 9.6.
<result>D</result>
The speed of a boat in still water in 20 km/hr and the rate of current is 4 km/hr. The distance travelled downstream in 24 minutes is: