Sarah drove to a supermarket. She stayed at the supermarket to shop and then she drove back home.
Here is Sarah's travel graph.
| Time | Distance from home (miles) |
|---|---|
| 11 00 | 0 |
| 11 15 | 6 |
| 11 55 | 6 |
| 12 20 | 0 |
A travel graph showing distance from home (miles) on the y-axis (0 to 10) against time on the x-axis (11 00 to 12 30). The graph consists of three straight line segments: from (11 00, 0) to (11 15, 6), from (11 15, 6) to (11 55, 6), and from (11 55, 6) to (12 20, 0). The y-axis has major grid lines every 2 units and minor grid lines every 0.5 units. The x-axis has major grid lines every 15 minutes and minor grid lines every 5 minutes.
For how many minutes did Sarah stay at the supermarket?
What was Sarah's average speed on her journey to the supermarket?
