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by arghya05 » Tue Jul 28, 2009 7:45 pm
Machine X runs at a constant rate and produces a lot consisting of 100 cans in 2 hours. How much less time would it take to produce the lot of cans if both machines X and Y were run simultaneously?
(1) Both machines X and Y produce the same number of cans per hour.
(2) It takes machine X twice as long to produce the lot of cans as it takes machines X and Y running simultaneously to produce the lot.
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Source: — Data Sufficiency |

by mehravikas » Tue Jul 28, 2009 11:05 pm
Answer should be D

(1) Both machines X and Y produce the same number of cans per hour. - It means machine Y also produces 50 cans per hour
(2) It takes machine X twice as long to produce the lot of cans as it takes machines X and Y running simultaneously to produce the lot. - Means if x can produce 50 cans in one hour, x + y can produce 100 cans in one hour.
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