Pawan is able to finish

Solution

ATQ, Pawan can complete 1/3^rd of a task in 10 days Therefore, Pawan can complete the whole task in 10 × 3 = 30 days. Therefore, Qureshi will complete the task in 30/2 = 15 days Let Raju takes 'd' days to complete the whole task alone. Let, the total task be 30d (L.C.M of 15, 30 and d) Efficiency of Pawan = 30d/30 = d unit/day Efficiency of Qureshi = 30d/15 = 2d unit/day Efficiency of Raju = 30d/d = 30 unit/day According to the question, 30d/(30 + 3d) = 8 Or, 30d = 24d + 240 Or, 6d = 240 Or, d = 40 days