Model a Journey: Speed and Distance

This question concers part of a homeward car journey made by Hilary. At 9.15am. Hilary is 200km from home, and, at 11.45am. she is 150km from home.

Choose the two True statements.

Options

A. Hilary's average speed for this part of the journey is 20km per hour

B. Hilary's average speed for this part of the journey is - 20km per hour.

C. Hilary's average velocity for this part of the journey is 20km per hour away from home.

D. On a distance-time graph, where the time axis is marked in hours since midnight and the distance axis is marked in kilometers from Hilary's home, the coordinates of the begining and end of this part of the journey are (9.15,200) and (11.75,150).

E. on a distance-time graph, were the time axis is marked in hours since midnight and the distance axis is marked in kilometers from Hilary's home, the coordinates of the beginning and end of this part of the journey are (9.25, 200) and (11.75, 150)

F. Hilary cannot have stopped between 9.15am and 11.45am.

G. Hilary cannot have travelled at more than 60km per hour between 9.15a.m. and 11.45.a.m.


H. Since her distance from home is decreasing. Hilary must have been reversing for this part of the journey.