M/J 18/P22/Q9 (a) On Monday, Ravi goes on a 20 km run. (i) His average speed for the first 12 km is \( x \mathrm{~km} / \mathrm{h} \). Write down an expression, in terms of \( x \), for the time taken for the first 12 km . Give your answer in minutes.

To determine the time Ravi takes to run the first 12 km at an average speed of \( x \) km/h, follow these steps: 1. **Formula for Time:** \[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \] 2. **Plug in the Values:** \[ \text{Time} = \frac{12 \text{ km}}{x \text{ km/h}} = \frac{12}{x} \text{ hours} \] 3. **Convert Hours to Minutes:** Since \( 1 \) hour equals \( 60 \) minutes: \[ \frac{12}{x} \text{ hours} \times 60 \text{ minutes/hour} = \frac{720}{x} \text{ minutes} \] **Final Expression:** \[ \frac{720}{x} \text{ minutes} \]