Speed of a boat in standing water is 9 kmph and the speed of the stream is 1. 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is Options:	A) 16 hours	B) 18 hours	C) 20 hours	D) 24 hours	E) None
Solution   Speed upsteram	= 7.5 kmph.   Speed downsteram	= 10.5 kmph.   Total time taken	=[10.5/7.5 + 105/10.5]hours   = 24 hours.   Answer 24 hours
<result>D</result>
Speed of a boat in standing water is 9 kmph and the speed of the stream is 1. 5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is