If a car goes from place a to place B at a speed of 40 kilometers per hour, it will arrive at the scheduled time. In fact, the car has been driving for three hours The speed slowed down to 30 km / h, so it was one hour later than expected

If a car goes from place a to place B at a speed of 40 kilometers per hour, it will arrive at the scheduled time. In fact, the car has been driving for three hours The speed slowed down to 30 km / h, so it was one hour later than expected

Suppose it takes x hours
40x = 40 times 3 + 30 (x-3 + 1)
The solution is x = 6
The distance is 6x40 = 240 km

The driving time of a car is fixed. Is the driving distance proportional to the speed? Why?

Yes. Distance equals speed times time, that is s = v.t. when t is quantitative, distance s is proportional to speed v