The speed at which a man can row a boat in still water is 18 kmph. If he rows downstream, where the speed of current is 3 kmph, what time will he take to cover 60 metres?  Choose the most appropriate option:
A) 16 seconds
B) 15.4 seconds
C) 26 seconds
D) 12 seconds
E) 18 seconds
Speed of the boat downstream = 18 + 3= 
<gadget id="calculator">18 + 3</gadget>
<output>21</output>
21 kmph= 21 * 5/18 = 35/9 m/s   Hence time taken to cover 60 m   = 60*9/35   = 15.4 seconds.   Answer: 15.4 seconds
<result>B</result>
The speed at which a man can row a boat in still water is 18 kmph. If he rows downstream, where the speed of current is 3 kmph, what time will he take to cover 60 metres?