Answer
28 minutes and 84 minutes
Work Step by Step
pump 1: 3x
pump 2: x
$1/3x + 1/x =60/21$
$1/3x +3/3x = 60/21$
$4/3x = 60/21$
$3x*60=4*21$
$180x = 84$
$180x/180 = 84/180$
$x = 28/60$
28 minutes
$28*3=84$
84 minutes
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.