SOLUTION: You jog at a speed of 6 miles per hour for 20 minutes, and you walk at a speed of 4 miles per hour for t minutes. If your combined jogging and walking distance is 3 miles, for how

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Question 563802: You jog at a speed of 6 miles per hour for 20 minutes, and you walk at a speed of 4 miles per hour for t minutes. If your combined jogging and walking distance is 3 miles, for how long did you walk?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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You jog at a speed of 6 miles per hour for 20 minutes, and you walk at a speed of 4 miles per hour for t minutes.
If your combined jogging and walking distance is 3 miles, for how long did you walk?
:
We are dealing with mph, so we have to put the min over 60
:
Write a distance equation; dist = speed * time
:
Dist at 6mph + dist at 4mph = 3 miles
6*20%2F60 + 4*t%2F60 = 3
Cancel
20%2F10 + t%2F15 = 3
mult by 30 to clear the denominators, results
3(20) + 2t = 30(3)
60 + 2t = 90
2t = 90 - 60
2t = 30
t = 15 min at 4 mph