The speed at which a man can row a boat in still water is 20 kmph. If he rows downstream, where the speed of current is 4 kmph, what time will he take to cover 80 metres?	Choose the correct choice from the following choices
A) 10.51  B) 11.51  C) 9.51  D) 13.51  E) 15.51
Speed of the boat downstream = 20+ 4= 
<gadget id="calculator">20+ 4</gadget>
<output>24</output>
24 kmph= 24 * 5/18 = 6.66 m/s
Hence time taken to cover 70 m = 70/6.66
= 10.51 seconds.
10.51nswer:10.51
<result>A</result>
The speed at which a man can row a boat in still water is 20 kmph. If he rows downstream, where the speed of current is 4 kmph, what time will he take to cover 80 metres?