Avat containing 10,000 gallons of black ink supplies 3 different printing presses. press 1 uses 12 gallons per minute, press 2 uses 10 gallons per minute and press 3 uses 15 gallons per minute. if the vat was full at 7: 30 am and all three presses run constantly when will the vat run dry?
12: 00 p. m.
12: 00 a. m.
12: 20 p. m.
2: 00 p. m.