1. P, Q, and R can complete a work in 42 days, 35 days, and 28 days respectively. P started the work and was assisted by Q and R on alternate days starting with Q. After 8 days P took a break, Q and R worked together during that period. Neither Q nor R worked for the last 7days. Find the total time taken to complete the work if P resumed his work for the last 7 days?
