Question 535304
an older machine can do a job in 104 minuets, it takes only 40 minuets when a newer machine works simultaneously. how long would it take the newer machine to do the job working alone?
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Let x = time (minutes) it takes for newer machine alone
then
40(1/104 + 1/x) = 1
multiplyb both sides 104x:
40(x + 104) = 104x
40x + 4160 = 104x
4160 = 64x
65 minutes = x