10. A and B can do a piece of work in 12 days, B and C in 15 days, and C and A in 20 days. How much time
will A alone take to finish the job?
Sneed. Distance and Time
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Answer:
2/A + 2/B + 2/C=1/12 + 1/15 + 1/20
=12/60=1/5
2/A=1/5 -2/B-2/C
1/B+1/C=1/15
2/B+2/C=2/15
2/A= 1/5–2/15 = 3/15–2/15 = 1/15
A=30 days working alone
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