Convert the following time units to seconds: a) 27 minutes, b) 2 hours, c) 45 minutes.

$$27 \text{ minutes} \times \frac{60 \text{ seconds}}{1 \text{ minute}} = 27 \times 60 \text{ seconds}$$ $$27 \times 60 = 1620 \text{ seconds}$$

The conversion of 27 minutes to seconds is:

$$\boxed{\text{1620 seconds}}$$

$$1 \text{ hour} = 60 \text{ minutes}$$ $$1 \text{ minute} = 60 \text{ seconds}$$

$$2 \text{ hours} \times \frac{60 \text{ minutes}}{1 \text{ hour}} = 120 \text{ minutes}$$ $$120 \text{ minutes} \times \frac{60 \text{ seconds}}{1 \text{ minute}} = 120 \times 60 \text{ seconds}$$ $$120 \times 60 = 7200 \text{ seconds}$$

The conversion of 2 hours to seconds is:

$$\boxed{\text{7200 seconds}}$$

$$45 \text{ minutes} \times \frac{60 \text{ seconds}}{1 \text{ minute}} = 45 \times 60 \text{ seconds}$$ $$45 \times 60 = 2700 \text{ seconds}$$

The conversion of 45 minutes to seconds is:

$$\boxed{\text{2700 seconds}}$$

$$10 \text{ minutes} \times \frac{60 \text{ seconds}}{1 \text{ minute}} = 10 \times 60 \text{ seconds}$$ $$10 \times 60 = 600 \text{ seconds}$$

The conversion of 10 minutes to seconds is:

$$\boxed{\text{600 seconds}}$$