According to the meaning of the question, after the swimming pool is filled with water, whose volume is: 25 X 12.5 X 1.2 =375 (cubic meter).

Water pipe diameter: 24cm=0.24m, radius: 0. 12m Water pipe cross-sectional area: 3.14x0.12x0.12 = 0.045216 (square meter).

The amount of water injected per minute can be obtained by multiplying the cross-sectional area of the water pipe by the water flow speed:

0.045216x100 = 4.5216 (m3)

Divide the total volume of swimming pool water by the volume injected per minute to get the minutes: about 82.94 minutes.