Two pipes A and B can fill a cistern in 20 minutes and 30 minutes
respectively. If these pipes are turned on alternately for 1 minute each
how long will it take to the cistern to fill?
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Answer:
12 minutes i think
Step-by-step explanation:
because 1/20 + 1/30 = 5/60 or 1/12
1/12 = 12 minutes
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