The speed at which a man can row a boat in still water is 9 kmph. If he rows downstream, where the speed of current is 3 kmph, what time will he take to cover 60 metres?
Choose the correct choice from the following answers:
A) 16 seconds  B) 34 seconds  C) 14 seconds  D) 18 seconds  E) 15 seconds
Speed of the boat downstream = 9 + 3= 
<gadget id="calculator">9 + 3</gadget>
<output>12</output>
12 kmph= 12 * 5/18 = 10/3 m/s   Hence time taken to cover 60 m = 60*3/10= 
<gadget id="calculator">60*3/10</gadget>
<output>18</output>
18 seconds.   Answer: 18 seconds
<result>D</result>
The speed at which a man can row a boat in still water is 9 kmph. If he rows downstream, where the speed of current is 3 kmph, what time will he take to cover 60 metres?