A man travelled a distance of 61 km. in 9 hours, partly

A man travelled a distance of 61 km. in 9 hours, partly by walking at the speed of 4 km./hr. and partly on bicycle at the speed of 9 km./hr. The distance covered by walking is

Let the distance covered on foot be x km.
∴ Distance covered on cycle = (61 – x) km.

Time =	Distance
	Speed

∴	x	+	61 − x	= 9
	4		9

⇒	x	−	x	= 9 −	61
	4		9		9

⇒	9x − 4x	=	81 − 61
	36		9

⇒	5x	=	20
	36		9

⇒ x =	20	×	36	= 16 km.
	9		5