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Combined rate shortcut? Not referring to A*B/A+B

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Hi,

Does anyone have a shortcut similar to the combined time shortcut in order to reach combined rates say when Machine A completes 20 widgets in 6 hours and Machine B completes 20 widgets in 8 hours? 20/6 + 20/8 (to get the combined rate) is very cumbersome and increases my risk of error in a game day environment.

Gratefully,
KC

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