Question

Working 2 hours per day, R1 alone can complete a work in 6 days. Working 5 hours per day, R2 alone can complete the same work in 4 days. Working 3 hours per day, in how many days both R1 and R2 together can complete the same work?

A 5 days
B 2.5 days
C 7 days
D 3.5 days
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