Pizza!
• Lucas can eat a pizza in 4 minutes.
• Mike can eat a pizza in 5 minutes
• There grandfather can eat a pizza in 20 minutes
If Lucas , Mike and their grandfather starts eating the same pizza at the same time , then how many seconds does it take to finish the pizza?
The answer is 120.
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1 pizza in four minutes is the same as 5 pizzas in 20 minutes.
1 pizza in 5 minutes is the same a 4 pizzas in 20 minutes.
The grandfather has 1 pizza in 20 minutes.
Therefore, the total number of pizzas Lucas, Mike and their grandfather can have in 20 minutes is 5 + 4 + 1 = 10.
This means that they can have 1 pizza in 2 minutes which is 120 seconds.