Q. A panel in coal mine produces 400 tonne per day. The number of persons employed in each of the three shifts is 110, 130 and 120. As per CMR, the minimum quantity of air that needs to be circulated at the last ventilation connection of the panel in m3/min is
(A) 780 (B) 900 (C) 1000 (D) 2400
Ans: 1000
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