It will take them 20 minutes to do the job working together.
<h3><u>Working time calculation</u></h3>
Given that Pete can do a job in 50 minutes while his brother Jim can do it in 1/2 the time, to determine how long it will take them to do the job working together, the following calculation must be performed:
1/1 + 2/1 = 3/1
1 / (3/1) = 1/3
60 min / 3 = 20 min
Therefore, it will take them 20 minutes to do the job working together.
