In the first 2 hours after Meadow's self-service laundry opens, m large washing machines and n small washing machines...

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In the first 2 hours after Meadow's self-service laundry opens, m large washing machines and n small washing machines are in continual use. Including the time for filling and emptying the washing machines, each load of laundry takes 30 minutes in a large washing machine and 20 minutes in a small washing machine. What is the total number of loads of laundry done at Meadow's self-service laundry during this 2-hour period?

1) n = 3m
2) 2m + 3n = 55

The OA is B