one pipes fill a tank in 1 hours and two pipes fill tank in how many hours
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work done by one pipe in 1 hr=1
work done by 2 pipe in 1 /2hr=2*1/2=1
two pipes fill tank in 1/2 hour
work done by 2 pipe in 1 /2hr=2*1/2=1
two pipes fill tank in 1/2 hour
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