If a boat goes 100 km downstream in 10 hours and 75 km upstream

If a boat goes 100 km downstream in 10 hours and 75 km upstream in 15 hours, then the speed of the stream is

As per the given in question ,

Rate downstream =	100	= 10 kmph
	10

Rate upstream =	75	= 5 kmph
	15

∴ Speed of current =	Rate downstream - Rate upstream
	2

Speed of current =	1	(10 - 5) = 2.5 kmph
	2

Aliter : Using Rule 1,

Here, p =	100	= 10 kmph
	10

q =	75	= 5 kmph
	15

Speed of Stream =		p - q		=		10 - 5		= 2.5 km/hr
		2				2