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 6 kmph, what time will he take to cover 100 metres? Choose the correct choice: A) 6.67seconds B) 18 seconds C) 26 seconds D) 14.99 seconds E) 6 seconds
Speed of the boat downstream = 18 +6= 
<gadget id="calculator">18 +6</gadget>
<output>24</output>
24 kmph= 24 * 5/18 = 6.67m/s   Hence time taken to cover 100 m = 100/6.67   = 14.99 seconds.   Answer:14.99 seconds
<result>D</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 6 kmph, what time will he take to cover 100 metres?