RRB NTPC CBT 2 Level 6 Exam 9 May 2022 Shift 1

Question : 114 of 120

Marks: +1, -0

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?