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(a) In 1 minute, G will fill 1/12 of the tank since it takes 12 minutes to fill the tank.

(b) In 1 minute, H will fill 1/8 of the tank.

In 1 min, both G and H will fill 1/12 + 1/8 = 5/24 of the tank.

To fill 1/3 of the tank, 

1/3  ÷  5/24  = 8/5 min

Multiply by 60 to convert minutes to seconds.

8/5 × 60 = 96 seconds

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