Remember: "distance equals rate times time", or d = rt.

ais going to be the first speed. But it's 2km/h, and t is supposed to be in minutes, so convert: .

The second speed is going to be .

Note that the speed changes after 45 minutes. We need to know the distance traveled: .

The equation find the distanceafter having run for 45 minutes @ 2 km/hwould be

so b = 1/15 and d = -1.5.

Therefore,

01