Till am, amount of tank filled = (12 + 6 2)/60 Remaining tank = 40/60 and when all four are on, filling ate is 10/60 per hours. So it takes four more hours.
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pls Expain
Till am, amount of tank filled = (12 + 6 2)/60
Remaining tank = 40/60 and when all four are on, filling ate is 10/60 per hours. So it takes four more hours.
Answer is 9 + 4 = 1 pm.