You jog at 9.5km/hr for 8.0km, 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 24km is to be 22km/hr?
The answer is 64km/hr, but I can't figure out how to get it

Question

You jog at 9.5km/hr for 8.0km, 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 24km is to be 22km/hr?  
The answer is 64km/hr, but  I can't figure out how to get it

phi · Answer

Can you figure out how much time the trip takes if you go 22 km/hr?
Can you figure out how much time you spent jogging?
the difference is how much time you have left to go 16 km.

anonymous · Answer

ahhhh, thanks phi