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Work done by A, B, and C together in 1 hour = 1/12 + 1/15 - 1/10 = (5 + 4 - 6)/60 = 3/60 = 1/20. In 5 hours, they fill = 5 × 1/20 = 1/4 of the tank. Remaining tank = 1 - 1/4 = 3/4. After C is closed, work done by A and B in 1 hour = 1/12 + 1/15 = (5 + 4)/60 = 9/60 = 3/20. Time to fill 3/4 of the tank = (3/4) ÷ (3/20) = 5 hours. Total time = 5 + 5 = 10 hours. Correct option: c
32, 50, 82, 124, 180, 252
224, 183, 144,115, 86, 63, 44.
29, 36, 59, 74, 105, 144
32, 41, 66, 115, 236, 415
640 1920 240 720 92 270
96, 480, 120, 360, 150, 750
1034, 2364, 4091, 6257, 9030, 12404
A-5, A, 35, 52, 78, 115
1, 2, 8, 48, 386, 3840
128, 128, 64, 192, 42 , 240