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 .

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

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