A group of 5 girls booked a computer for 2 hours. They took turns to work on the computer for their project. At any time, only 3 girls worked on the computer. On average, how long did each girl work on the computer? Give your answer in hours and minutes. Ans: ___

1. Calculate the total computer time available

Total computer time $= 3 \text{ girls} \times 2 \text{ hours} = 6 \text{ hours}$

2. Calculate the average time each girl worked on the computer

Average time per girl $= \frac{6 \text{ hours}}{5 \text{ girls}} = 1.2 \text{ hours}$

3. Convert the time into hours and minutes

$1.2 \text{ hours} = 1 \text{ hour} + 0.2 \times 60 \text{ minutes} = 1 \text{ hour } 12 \text{ minutes}$