Mohan is writing on a chalkboard that is initially empty. It ordinarily takes Mohan 50 minutes to cover the whole board. Sohan is erasing the board while Mohan is writing. Sohan can erase the whole board in 80 minutes by himself. If they work simultaneously, how long will it be until the whole board is covered?
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M need time to cover board = 50 min
S need time to erase board = 80 min
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