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Question 814786: In 2 minutes a conveyor belt moves 800 pounds of aluminum from the delivery truck to a storage area. A smaller belt moves the same quality of cans in 4 minutes. If both belts are used find out how long it takes to move the cans to the storage area?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! r = w / t
t = w / r
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a = 800 / 2 = 400 lb/min
b = 800 / 4 = 200 lb/min
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a + b = 600 lb/min
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t = 800 / (a + b)
t = 800 lb / 600 lb/min = 1.33333 min = 1 min and 20 seconds
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