Two pumps

Pump A takes twice as long to fill a tank as B. Together, they take 2 hours to fill the tank. How long does each one take to fill the tank by itself?

Correct answer:

A =  6 h
B =  3 h

Step-by-step explanation:

A=2B 1/A+1/B=1/2 1/A+2/A=1/2 3/A=1/2 A=3 2=6 h
B=A/2=6/2=3=3 h  s=2 (A1+B1)=2 (61+31)=1



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