A dishwasher can wash 14 plates per minute. Another dishwasher can wash 10 plates per minute. How many minutes will the two working together need to wash 1,560 plates?
the dishwashers can wash 14p/mn+10p/mn=24plates /mn so 1mn ..................> 24 plates X=? <...................1,560 plates so X= 1560/24= 65 minutes
