Work Efficiency — MCQ Practice

A can finish a job in 12 days and B in 18 days. Under constant independent rates, how long do they take together?

A is 25% more efficient than B at the same job. By what percentage is A’s completion time less than B’s?

A takes 10 days and B takes 15 days to finish a job. They work together for 3 days, then B leaves. How many additional days does A need?

A machine completes 3/5 of a job in 6 hours at a constant rate. How long will it take to complete the remaining work?

An inlet fills a tank in 8 hours and a leak empties a full tank in 24 hours. With both constant rates operating, how long does an empty tank take to fill?