Jes makes 4 pizzas on her own in 20 minutes, whereas Kyle, on his own, makes 4 pizzas in 30 minutes. How long, in minutes, does it take Jes and Kyle to make 20 pizzas when they work together?

Answer 1

In one minute,
Jes makes 4/20 = 1/5 pizza
Kyle makes 4/30 = 2/15 pizza
So, together, in one minute, they make 1/3 pizza
20 pizzas * 3 min/pizza = 60 minutes