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OpenStudy (anonymous):
F o u r p i p e s fill a t a n k in 1 5, 2 0 , 30 a n d 40 h o u rs respectively. T h e first pipe wa s o p e n e d at 6 am, the second at 8 am, the third at 10 am and the fourth at 12 noon. When will the tank get filled completely?
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OpenStudy (shubhamsrg):
W h y ha v e you w r i tt e n l i ke t h i s ?
OpenStudy (anonymous):
http://openstudy.com/study#/updates/512ee556e4b098bb5fbced6f Refer to the last posting to the above problem.
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