Question

A) How long was she stationary for?

b) What was the total distance travelled during her journey?
c) What was her average speed in kilometres per hour between 17: 15 and 17: 45?
Distance from home (km)
9
0
17:00
17:15
17:30
17:45
Time
18:00
18:15

Answer 1

a) When she is stationary, the distance does not increase/decrease.

-> The line is flat.

We see that the period where the line is flat is 7.5 minutes.

b) The total distance travelled is the distance she travelled away + back from/to home.

-> 25 x 2 = 50km

c) Average speed = Total distance/total time.

-> 20/0.5 = 40(km/h)