A bus moving at a speed of 45 km/hr overtakes a truck 150

A bus moving at a speed of 45 km/hr overtakes a truck 150 metres ahead going in the same direction in 30 seconds. The speed of the truck is

Let the speed of the truck be x kmph
Relative speed of the bus = (45 - x) kmph

∴ Time =	Distance
	Relative speed

⇒	30
	60 × 60

⇒	1	=	15
	120		100(45 − x)

⇒	1	=	3	⇒ (45 − x) = 18
	6		(45 − x)

⇒ x = 45 – 18 = 27 kmph