RRB NTPC 2017 · Question 394 of 1076

P, Q and R can do a work in 10, 15 and 30 days respectively. P works daily. Q and R together join P on alternate days starting the first day. In how many days will the work be done?

1. A$$6\frac{1}{3}$$
2. B$$6\frac{3}{4}$$
3. C$$6\frac{1}{2}$$Correct
4. D$$6$$