its usually called a polyrhythm or hemiola where there are two patterns that are played within a set time frame using different subdivisions of the quarternote. yours for instance would be 5 against 7. most commons are 3 against 2 and 4 against 3. if you are playing quarternotes on one hand and triplets on the other in the same tempo you start and end the same but are playing 4 against 3.
hope that makes sense
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