Question

John can can do a job in 2 hours. His friend, Ben, can can do the same job in 6 hours. How long would it take for two of them to do the job together?

Answer 1

1.2 hours

Explanation:

John can do a job in 2 hours

Ben can do the same job in 6 hours

Let y represent the time it will take both men to do the job together

y/2 + y/6=1

5y/6= 1

Cross multiply

5y = 6

y= 6/5

y= 1.2

Hence it will take both of them 1.2 hours to finish the work together