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Well no need for such huge calculations. this can be explained very easily ! the above fact means : machine 1 can finish it in 12 hrs. Machine 2 in 15 and machine 3 in 18 hrs. So machine 2 and 3 will, combined, take 1/(1/15+1/18) . U first calculate the rate per hour done by both and then invert it ...
- by icespray89
Tue Jul 31, 2012 7:10 pm- Forum: Problem Solving
- Topic: og math # 130
- Replies: 132
- Views: 58089