Question

A car travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. what is the average speed for the first 320 km of the tour?

Answer 1

Car covers 64 km in in 1 hour

Therefore it covers 160km in 160/64=2.5 hours

Similarlry it covers 80kms in 1 hour

Therefore the next 160km it covers in 2hours

Therefore it covers 320km in 2+2.5=4.5 hours

So in one hour it covers 320/4.5=71.1kms

The avg speed of covering 320 kms is 71.1km/hr