SOLUTION: Machine A produces bolts at a uniform rate of 120 bolts every 40 seconds and machine B produces bolts at a uniform rate of 100 bolts every 20 seconds. If the two machines are run

Question 998506: Machine A produces bolts at a uniform rate of 120 bolts every 40 seconds and machine B produces bolts at a uniform rate of 100 bolts every 20 seconds. If the two machines are run simultaneously, how many seconds will it take for them to produce a total of 200 bolts?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Machine A ==> 120 bolts/40 sec = 3 bolts/sec
Machine B ==> 100 bolts/20 sec = 5 bolts/sec
So together they make 8 bolts/sec.
To make 200 bolts, they will need
200 bolts / (8 bots/sec) = 25 seconds
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