Asked by Zara

You jog at 9.5 km/h for 7.0km , then you jump into a car and drive an additional 16km . With what average speed must you drive your car if your average speed for the entire 23km is to be 22 km/h?

Work: i tried setting up a proportion and setting it to each other using the velocity formula but i got the question wrong so I want to know how to start. thanks
Answered by Damon
time for phase 1 = 7/9.5 = .737 hr

time for entire trip = 23/22 = 1.045 hr

time for 16 km = 1.045 - .737
= .308 hr

speed for 16 km = 16/.308 = 52 km/hr

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