A pontoon, 4 m long x 4 m wide x 2 m deep, floats in fresh water with a draft of 1.50m. Compute the time for the pontoon to sink to its top edge, after opening a standard orifice 15 cm in diameter (C=0.60) located at its bottom. a. 215 seconds b. 139 seconds c. 235 seconds d. 125 seconds

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