Question

P, Q, R can do a piece of work in 40 days, 90 days, and 36 days, respectively. P started the work. Q joined him after 7 days. If R joined them after 8 days from the beginning, then for how many days did R work?

A 11(8/23)
B 12(8/23)
C 15(8/23)
D 13(8/23)
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