You jog at 9.5 km/h for 7.0 km , then you jump into a car and drive an additional 18 km. with what average speed must you drive your car if your average speed for the entire 25 km is to be 22 km/h?

Average speed of car is 45 .

Explanation:

Average speed for entire 25 km is 22

Average speed =

22 =

Total time =

Total time = 1.136 hour

Time for first 7 km is given by t,

t =

t =

t = 0.736 hour

Thus, time required for next 18 km is

T = Total time - t

T = 1.136 - 0.736

T = 0.4 hour

Hence, average speed of car for 18 km is given by,

Average speed, v =

v = 45

Average speed of car is 45 .

b

explanation:

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c) both a and b.