Affects of series driven induction motors

What would be the affects on a 3 phase induction motor down-stream of another 3 phase induction motor? Basically, the first (and generally larger) is a centrifugal pump, 2-pole, used for mixing. The second (or down stream) pump is a 4 pole gear pump, used for recycle, usually smaller in size (about half the size of the mixing motor). When the mixing motor is running, the motive force is enough to start rotating the recycle pump. There is a significant change in the ampacity and rpm of the recycle motor. What affects does this potentially have on the motor and/or power transmission?