The speed of a boat in still water is 20 km/hr and the rate of current is 5 km/hr. The distance travelled downstream in 18 minutes is: Select:
A) 9.5	B) 5.5	C) 7.5	D) 6.5	E) 5.1
Explanation:   Speed downstream = (20+5)= 
<gadget id="calculator">(20+5)</gadget>
<output>25</output>
25 kmph   Distance travelled= (25*(18/60))= 
<gadget id="calculator">(25*(18/60))</gadget>
<output>15/2 = around 7.5</output>
7.5 km.   ANSWER:7.5
<result>C</result>
The speed of a boat in still water is 20 km/hr and the rate of current is 5 km/hr. The distance travelled downstream in 18 minutes is: