| Exam Board | SPS |
|---|
| Module | SPS SM (SPS SM) |
|---|
| Year | 2021 |
|---|
| Session | January |
|---|
| Topic | Differentiation Applications |
|---|
| Type | Find stationary points |
|---|
9.
The total cost \(C\), in \(\pounds\), for a certain car journey, is modelled by
$$C = \frac { 200 } { V } + \frac { 2 V } { 25 } , V > 30 ,$$
where \(V\) is the average speed in miles per hour.
a) Find the value of \(V\) for which \(C\) is stationary.