3 years ago in Time and Work

A complete 7/10 of a work in 15 days, then he completed the remaining work with the help of B in 4 days. In how many day A and B can complete entire work together?

[A] 10(1/2) days
[B] 12(2/3) days
[C] 13(1/3) days
[D] 8(1/4) days

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