Two pipes a and b fill a tank in 30 minutes and 45 minutes respectively both pipes are opened. the tank will be filled just 20 minutes if pipe b turned after how much minutes
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A =1/30
B =1/45
Let after t time b turned off
Than t*(1/30+1/45)+ (20-t)*1/30=1
45*t + 30 t +20*45 - 45t=30*45
T =450/30=15 minutes
B =1/45
Let after t time b turned off
Than t*(1/30+1/45)+ (20-t)*1/30=1
45*t + 30 t +20*45 - 45t=30*45
T =450/30=15 minutes
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