P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?
1). 20 days
2). 30 days
3). 40 days
4). 10 days
P’s one - day work = 1/50
Q’s one - day work = 1/20
One - day work of both P and Q = 1/50 + 1/20 = 7/100
Total time taken to complete the work = 100/7 days
Time taken to complete 70% of work = (70/100) × (100/7) = 10 days