Write and equation and solve with steps

Question

ron can make a batch of 100 large pizza crusts in 1.2 h less than chad. together they can do the job in 1.8 h , how long does it take each to do the job alone 

Answer 1

variables:

R = ron

C = chad

 

equations:

r = c-1.2  or

c-r = 1.2

 

r+c =1.8

add equations:

2c = 3.0

c = 1.5

 

1.8-1.5 = .3

r = .3