Asghar can do a job in 10 days. Both Asghar and Babar together can do the same job in 20 days. How long will Babar alone take to complete the job?

🧠 Explanation:

Asghar takes 10 days to complete a job alone. Together, Asghar and Babar take 20 days, which seems inconsistent but may imply a misstated problem. Assuming Babar alone takes x days, combined work rate is 1/10 + 1/x = 1/20. Solving: 1/x = 1/20 - 1/10 = -1/20, which is invalid. If the problem meant 20/3 days together, Babar’s time is 30 days (1/10 + 1/x = 3/20). This work-rate problem is key in mathematics, applicable in project planning or resource allocation.