How far can a car traveling at a rate of 40 kilometer per hour travelbin 2 1/2 hours

Supposing it stays traveling at 40 kph you'll travel exactly 40 kilometers in just one hour. So in 2 hours you'll have travel 80 Kilometers. and in half an hour you travel 20 which is the Half of 40. And 20+80 = 100 Kilometers.

90 kilometers because you need to multiply 40 by 2 and then you get 80 and finally you add 10 and get 90 kilometers