SOLUTION: Machine A can produce 40 bolts per minute whereas Machine B can produce only 30 per minute. Machine A begins alone to make bolts but it breaks down after 1 1/2 minutes and Machine

Question 768206: Machine A can produce 40 bolts per minute whereas Machine B can produce only 30 per minute. Machine A begins alone to make bolts but it breaks down after 1 1/2 minutes and Machine B must complete the job. If the job requires 300 bolts how long does the whole operation take?
A) 7 1/2 minutes
B) 8 minutes
C) 8 1/2 minutes
D) 9 minutes
E) 9 1/2 minutes
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In min, machine A produces
bolts
-------------
Now, machine B must produce
bolts
-------------
For machine B,
( number of bolts produced ) = ( rate of producing )*( time spent producing )
Let = B's time in mins

min
------------
The total time to produce 300 bolts is:
min

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