Join ExamsbookAnswer : 3. "10.2"
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……5
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……
- 16.6false
- 28.5false
- 310.2true
- 413.5false
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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×Speed
42=x5+3×2
Then x=7.2 so that total Time=7.2+3=10.2
