Three workers can complete a job in 6 hours. How long will it take if only 2 workers do the job?
Answer
9 hours
How to solve it
1
Total work: 3 workers × 6 hours = 18 worker-hours
2
2 workers: 18 ÷ 2 = 9 hours
Hints
Calculate total worker-hours
Divide by new number of workers