Four children can eat a large pizza in 12 minutes. How long would it take 9 children to eat the same

Four children can eat a large pizza in 12 minutes. How long would it take 9 children to eat the same pizza? (Give your answer in minutes and seconds.)

One child can eat the pizza in 4 * 12 minutes = 48 minutes

48 minutes per child / 9 children = 5.3333 minutes

1/3 of a minute = 20 seconds, so we have:
5 minutes and 20 seconds