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Steve's Elevator = S, travels at rate of 57 floors per min, so for every second S climbs 57/60 floors =>19/20 floors
Joyce Elevator = J, travels at the rate of 63 floors per min, so for every second J travels 63/60 floors => 21/20 floors
In twenty seconds, S would have climbed 19 floors (30th floor) and J would have traveled 21 floors (30th floor)
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