This has to be the most confusing GMAT question I've ever encountered. I think the question is worded poorly because I can't comprehend what it means, even after reading the question multiple times and the solution multiple times. If someone could chime in, I'd appreciate it.
A machine consisting of 3 connected wheels is mixing concrete. The engine is running at a speed of 60 rpm and the mixer is mixing at a rate of 8 rpm. If the radius of the smaller (drive) wheel is 2 inches, what is the diameter of the mixing wheel?
Out of the 3 wheels, which is the "mixing wheel"? Is the "mixer" a part of the machine or is it its own separate wheel? What does the engine have to do with this?