A and B can do a piece of work in 6 days, B and C do it in 10 days and C and A do it in 15 days . (a) In how many days will A,B and C finish it working together ? (b) in how many days will A and B finish their working alone ?
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In 11 days the a and b and c will do the work
ghanashyambora:
how
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