Question

one custodian cleans a suite of offices in 9 hours when a second worker is asked to join the regular custodian the job takes only four and a half hours how long does it take the second worker to do the same job alone

Answer 1

9 hours is the answer.

Answer 2

9 hours

Explanation:

9 hours by one custodian divided by 2 custodians equals 4.5

4.5 x 2 = 9