A large concrete mixing machine can mix a certain amount of concede in 12 hours, while a smallet one can mix
1 answer:
Answer:
[(1/12)(5/5) + (1/20)(3/3)](x hours) = 1
(5/60 + 3/60)x = 1
(8/60)x = 1 we can reduce 8/60 by dividing out a 4
(2/15)x = 1 x both sides by 15/2
x = 15/2
x = 7 1/2 or 7.5 hours
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(3/4) / (1/6) =
3/4 * 6/1 =
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4.5 miles per hr <==
