A car moves a distance of 200 m. It covers the first half

A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at speed v. The average speed is 48 km/h. Find the value of v

or	1	+	1	=	2	=	1
	40		v		48		24

or	1	=	1	-	1	=	2	=	1
	v		24		40		120		60

or v = 60 km.h

[Alt : v_av =	2v₁v₂	⇒ 48 =	2 × 40 × v
	v₁ + v₂		40 + v

⇒ v = 60 km/h]