Step 1: Determine How Long It Takes to Eat a Whole Pizza

Donna can eat a quarter of a pizza in just one minute. So, to figure out how long it takes her to finish an entire pizza, we simply multiply the time for one-quarter by four:

Time for one pizza = 4 × 1 minute = 4 minutes

Step 2: Calculate the Time Needed to Eat 2.5 Pizzas

Now that we know it takes Donna 4 minutes to eat one pizza, we can easily calculate the total time for 2.5 pizzas by multiplying the time for one pizza by 2.5:

Total time = 2.5 × 4 minutes = 10 minutes

Conclusion

In conclusion, Donna will need 10 minutes to eat 2.5 pizzas.