A truck travels at 90 km/hr for the first 11hours. After

A truck travels at 90 km/hr for
the first 1 1 hours. After that it travels at 70 km/hr.
2
Find the time taken by the truck to travel 310 kilometres.

Distance covered by truck in	3	hours
	2

= Speed × Time

= 90 ×	3	= 135 km
	2

Remaining distance
= 310 – 135 = 175 km
∴ Time taken at 70 kmph

=	175	= 2.5 hours
	70

∴ Total time = 1.5 + 2.5 = 4 hours