Hi, I was just wondering if one had a system of 2 different gear ratios to one output shaft.

For example: Two identical motors A and B rev at 1000 rpm and have a torque of 10Nm. These motors are geared in the ratios of 2:1 and 0.5:1 respectively to the same output shaft, what would be the output torque and rpm, what would the characteristics of this setup, and does this type of system have any advantages over an ordinary system ?

Thanks in advance