Question

A journey between two towns, Pietermaritzburg and Durban, is exactly 90km.
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 the time taken (y) to complete the trip. HINT: time should be in minutes
3.2 Describe what happens to y (the time) when x (the speed) increases
3.3 Is it possible that a vehicle could travel so fast that the trip could be done in no time at all? Give a reason for your answer
3.4 How does the trend of the graph relate to the question in 3.3?

Answer 1

Answer:

Step-by-step explanation:

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