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Q: A can do a piece of work in 14 days which B can do in 21 days. The begin together but 3 days before the completion of the work, A leaves off. The total number of days to complete the work is……

  • 1
    6.6
  • 2
    8.5
  • 3
    10.2
  • 4
    13.5
  • Show Answer
  • Workspace

Answer : 3. "10.2"
Explanation :

A=14 days

B-21 days

Total work =taking L.C.M=42 is the total work

Let both together work x days

A=3 speed

B=2 speed so that Total work=Time×Speed42=x5+3×2

Then x=7.2 so that total Time=7.2+3=10.2

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