5. A. Band C working together take 8 min. to address a pile of envelopes. A and B together would take 10; A and B TOGETHER WOULD TAKE 10 MIN; A AND C TOGETHER WOULD TAKE 15 MIN . HOW LONG WOULD EACH TAKE WORKING ALONE?
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A,B and C working together can plough a field in 24/5 days .A and C together can do it in 8 days .How long would B working alone take to ...
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