SOLUTION: At a local gravel yard, a large skip loader can move a large pile of gravel in 15 minutes. A smaller skip loader can move the same pile of gravel in 2.25 hours. How many minutes wo

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Question 1027978: At a local gravel yard, a large skip loader can move a large pile of gravel in 15 minutes. A smaller skip loader can move the same pile of gravel in 2.25 hours. How many minutes would it take the two skip loaders working together to move the gravel pile?
(Include units with your numerical answer. Round your answer to one decimal place.)
It would take about_______for the two skip loaders working together to move the gravel pile.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Rate unit should be PILES per HOUR or as PILE per HOURS.

0.25%2Ahour=15%2Aminutes=%281%2F4%29%2Ahour 

Which Skip Loader    RATE, PILES per HOURS

Large loader,        1/(1/4)=4


Small loader,        1/(2&1/4)=1/(9/4)=4/9


Combined rate for both loaders working together is 4%2B4%2F9
36%2F9%2B4%2F9
40%2F9
but if you want TIME for loading or moving 1 whole pile, then %289%2F40%29%28hours%2Fpile%29;
%289%2F40%29%2Ahour%2A60%28minutes%2Fhour%29
9%2A6%2F4
9%2A3%2F2
27%2F2
highlight%28%2813%261%2F2%29%2AMINUTES%29