Question

A journey between two towns, Pietermaritzburg and Durban, is exactly 90 km 3.1 Use a graph (with at least 5 different speeds in km/h) to model how variation in speed (x) over the journey causes variation in time taken (y) to complete the trip. ​

Answer 1

Speed in km/hr Time in Minutes

90 60

45 120

30 180

15 360

10 540

time Decrease when speed increase

Number of times the speed is increased the number of times time taken is reduced so it is not possible to take no time at all

as we can see from the graph that it is exponential , reduction in time keep reducing with increase in speed

Explanation: