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⟩ Suppose Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins. If all of them work together, find the timetaken to fill the tank?

a fill - 1/20 per minute

b fill - 1/30 per minute

c can empty - 1/40 per minute

Suppose this take x minute

1 x +1x - 1x

--- -- ---- =1

20 30 40

Solve this x=17(approximately)

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