The speed of a boat in still water in 20 km/hr and the rate of current is 5 km/hr. The distance travelled downstream in 24 minutes is: Choose the correct choice from the following.
A) 10.6 B) 10.2 C) 10.8 D) 10.4 E) 10.0
Speed downstream = (20 + 5)= 
<gadget id="calculator">(20 + 5)</gadget>
<output>25</output>
25 kmph   Time= 24 minutes =24/60 hour = 2/5 hour   Distance travelled = Time × speed =2/5×25 = 10.0 km   Answer is 10.0.
<result>E</result>
The speed of a boat in still water in 20 km/hr and the rate of current is 5 km/hr. The distance travelled downstream in 24 minutes is: