The speed at which a man can row a boat in still water is 15 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:	A) 22 seconds	B) 65 seconds	C) 78 seconds	D) 12 seconds	E) 21 seconds
Speed of the boat downstream   = 15 + 3= 
<gadget id="calculator">15 + 3</gadget>
<output>18</output>
18 kmph= 18 * 5/18= 
<gadget id="calculator">18 * 5/18</gadget>
<output>5</output>
5 m/s   Hence time taken to cover 60 m= 60/5= 
<gadget id="calculator">60/5</gadget>
<output>12</output>
12 seconds.   Answer:12 seconds
<result>D</result>
The speed at which a man can row a boat in still water is 15 kmph. If he rows downstream, where the speed of current is 3 kmph, what time will he take to cover 60 metres?