July 19, 2015
These problems are often referred to as combined work or even simultaneous work problems. In reality they are combined rate problems, but worth their individual attention.
The rate equation is the exact same here, but typically, instead of distance we are computing some output. This means:
GMAT work problems are just like a rate problem in which you add the rates for a combined rate. Thus, the sum of two rates will give you the combined output. Or:
These problems will typically entail ...