# Pipe A can fill in 20 minutes and Pipe B in 30 minutes and pipe C can dump the same in 40 mins.If all of them work together , find the time it takes to fill the tank

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hey guys thanks for answering so far..just want to clarify that by Dump I mean that Pipe C can EMPTY the tank in 40 mins

Here s a suggestion: take out there rates per minute (1/20, 1/30, 1/40) and then add rate of pipe a and pipe b and subtract pipe c.

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