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 correct option:
A) 23	B) 27	C) 28	D) 12	E) 18

Rationale: speed of the boat downstream = 16 + 4 = 20 kmph = 20 * 5 / 18 = 5.55 m / s hence time taken to cover 100 m = 100 / 5.55 = 18 seconds . answer : e
Answer: E