SOLUTION: If A can Fill tank in 20 min and B can empty that tank in 30 min, If they work alternatively 1 min, then how much time has been taken to filled the tank completely.

Question 896278: If A can Fill tank in 20 min and B can empty that tank in 30 min, If they work alternatively 1 min, then how much time has been taken to filled the tank completely.
Answer by josgarithmetic(39799) (Show Source): You can put this solution on YOUR website!
A and B alternate over a 2 minute period for some quantity of these periods.

, a two minute period.
Same as (1/20-1/30)*p, using p to count the number of these two-minute periods.

Fill 1 tank.

, the count of the two-minute alternating time periods.

This means, minutes,
2 hours.
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