The graph illustrates how the distance travelled by a vehicle varies with time. Which row gives the vehicle’s speed in each part of the graph?
- AP to Q: constant; Q to R: zero; R to S: constant
- BP to Q: constant; Q to R: zero; R to S: decreasing
- CP to Q: increasing; Q to R: constant; R to S: decreasing
- DP to Q: increasing; Q to R: zero; R to S: constant