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11. A, B and C can do a job in 12 h. 20 h and 30 h respectively. If they all work together, howlong will they take to complete the job? |
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Answer» Answer: 20 hours 36 minutes Step-by-step EXPLANATION: MEAN = 12+20+30 -------------- = 62 ----- 3 = 20.6 1 hour = 60 minutes 60÷10=6minutes Let the number multiplied be x Therefore, 6x= 6 × 6 = 36 minutes 20.6x = 1 × 20 + 36 = 20 hours 36 minutes |
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