7 पुरुष प्रतिदिन 7 घंटे कार्य करके 6 दिनों में 14 बक्से पैक कर सकते हैं। यदि 14 पुरुष प्रतिदिन 9 घंटे कार्य करते हैं, तो उन्हें 18 बक्से पैक करने के लिए कितने दिनों की आवश्यकता होगी?

If P and Q together can complete a piece of work in 15 days and P alone can do it in 45 days, in how many days can Q alone complete that work?

A can lay a railway track between two stations in 16 days and B can do the same job in 12 days. With the help of C, they finished the job in 4 days. In how many days can C alone do the job?