A man rows down a river 15 km in 3 hrs. with the stream

A man rows down a river 15 km in 3 hrs. with the stream and returns in 7 1 hrs,
2
The rate at which he rows in still water is

Let speed of person in still water = p kmph and speed of current = q kmph

∴ p + q =	15	= 5 kmph ........( 1 )
	3

p - q = 2 kmph ......( 2 )
On adding equations ( 1 ) and ( 2 ) ,

2p = 7 ⇒ p =	7	= 3.5 kmph
	2

We can find the required answer with the help of given formula : :

Here, p =	15	= 5 kmph
	3

q = 2 km/hr

Speed of Boat =	1	(p + q)
	2

Speed of Boat =	1	(5 + 2) = 3.5 kmph
	2

A man rows down a river 15 km in 3 hrs. with the stream and returns in 7	1	hrs,
	2