SOLUTION: At 11 am Mandy begins cycling west averaging 30 mph. Twenty minutes later Liz leaves from the same point going the same direction averaging 36 mph. At what time will Liz catch up

Question 804923: At 11 am Mandy begins cycling west averaging 30 mph. Twenty minutes later Liz leaves from the same point going the same direction averaging 36 mph. At what time will Liz catch up to Mandy?
Mandy 30 mph at 11 .5 miles a minute
Liz 36 mph at 11:20 1.67 miles a minute
difference 6 mph
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
At 11 am Mandy begins cycling west averaging 30 mph. Twenty minutes later Liz leaves from the same point going the same direction averaging 36 mph. At what time will Liz catch up to Mandy?
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In 20 minutes, Mandy is 10 miles away.
Liz gains on her at 6 mi/hr
10/6 = 5/3 hours = 1 hr 40 minutes
11:20 + 1:40 = 1300 hours = 1 PM

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