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300 + 180 – 130 = 350 (net inflow of water into the container in 1 min)
350 x 13 = 4550 (net inflow of water into the container in 13 min)
20 x 15 x 15 = 4500 (volume of water in the container at a height of 15 cm)
4550 – 4500 = 50 (volume of water above 15 cm)
50/[(5 x 4) + (8 x 4) = 25/26
15 + 25/26 = 15 25/26

Ans : 15 25/26 cm.

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