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The national primary and secondary school mathematics thinking training textbook "Thinking Mathematics", grade six, page 54, question 7.
Let A inject x cubic meters of water every minute, then B injects x-0.28 cubic meters of water every minute, which is obtained by the equation.

(x+x-0.28)× 10 = 9x+(x+x-0.28)×4

X=0.56 when solving the equation.

So the volume of the pool v = (0.56+0.56-0.28) ×10 = 8.4 cubic meters.

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