P can do a work in 10 days. Q can do the same work in 15 day

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P can do a work in 10 days. Q can do the same work in 15 days. If they work together for 5 days, how much of the work will they complete?

[RRB NTPC 30 March 2016 Shift 1]

A 1/2

B 2/3

C 1/3

D 5/6