Marsha can cook 5 cakes or 10 pizzas in an hour howard can cook 3 cakes or 12 pizzas in a hour. which items should each person specialize in

Marsha specialize in cooking cakes, Howard specializes in cooking pizza.

In this case, Marsha can cook 5 cakes/hr but Howard is 3 cakes/hr. That means Marsha can cook cakes 1.6 times faster than Howard.
In cooking pizza, Howard can cook 12 pizzas/hr and Marsha only 10 pizzas/hr. That means Howard cook pizza 1.2 times faster than Marsha.