The speed at which a man can row a boat in still water is 16 kmph. If he rows downstream, where the speed of current is 4 kmph, what time will he take to cover 100 metres? Choose the most appropriate option:
A) 23	B) 27	C) 28	D) 12	E) 18
Speed of the boat downstream = 16 +4= 
<gadget id="calculator">16 +4</gadget>
<output>20</output>
20 kmph= 20 * 5/18 = 5.55 m/s
Hence time taken to cover 100 m = 100/5.55
= 18 seconds.
Answer:18
<result>E</result>
The speed at which a man can row a boat in still water is 16 kmph. If he rows downstream, where the speed of current is 4 kmph, what time will he take to cover 100 metres?