A car travelling at a speed of 40 km/hour can complete a

A car travelling at a speed of 40 km/hour can complete a journey in 9 hours. How long will it take to travel the same distance at 60 km/hour ?

Total distance covered
= Speed × Time
= 40 × 9 = 360 km.
The required time at 60 kmph

=	360	= 6 hours.
	60

Second Method :
Using Rule 9,
Here, S₁ = 40, t₁ = 9
S₂ = 60, t₂ = ?
S₁t₁ = S₂t₂
40 × 9 = 60 × t₂

t₂ =	4 × 9	= 6 hours.
	6

4	1	hours
	2