## Questions/Answers from Past Papers

### Q u e s t i o n

A digital stop-clock measures time in minutes and seconds.

The stop-clock reads 00:50 when it is started (i.e. 00 minutes 50 seconds).

It reads 02:10 when it is stopped.

What is the shortest possible time that has elapsed between starting and stopping the stop-clock?

**A** 1 minute 20 seconds**B** 2 minutes 00 seconds**C ** 2 minutes 10 seconds**D** 3 minutes 00 seconds

### Q u e s t i o n

A long-distance runner wishes to calculate her average speed for a race.

Which calculation should she use?

**A** \( \text{average speed} = {\text{total time} \over \text{total distance}} \)**B** average speed = total distance × total time**C ** \( \text{average speed} = {\text{total distance} \over \text{total time}} \)**D** average speed = total distance + total time