Question
Three pipes A, B, and C can fill a tank in 15 hours, 20 hours, and 25 hours respectively. All three pipes are opened together, but after 4 hours, pipe C is closed. How much more time will it take to fill the tank completely?
Solution
Calculate the combined rate of all three pipes (A, B, C):
Work done in the first 4 hours (all pipes open):
Remaining work:
Rate after closing pipe C (only A and B):
Time to complete remaining work:
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