A man travels some distance at a speed of 12 km/hr and returns

A man travels some distance at a speed of 12 km/hr and returns at a speed of 9 km/hr. If the total time taken by him is 2 hrs 20 minutes the distance is

Let the required distance be x km.

Time = 2 hours 20 minutes 2	1	hours
	3

According to the question,

x	+	x	=	7
12	+	9	=	3

⇒	3x + 4x	=	7
	36		3

⇒	7x	=	7
	36		3

⇒ x =	7	×	36	= 12 km.
	3		7