Task: Question Answering
Input (English): Problem: pipe a and pipe b fill water into a tank of capacity 1000 litres , at a rate of 200 l / min and 50 l / min . pipe c drains at a rate of 25 l / min . pipe a is open for 1 min and closed , then pipe b is open for 2 min and closed . further the pipe c is opened and drained for another 2 min . this process is repeated until the tank is filled . how long will it take to fill the tank ? 
Options: a ) 15 , b ) 17 , c ) 18 , d ) 56 , e ) 20
Output (English): e