SOLUTION: bob is 80 miles ahead moving 50mph and joe is traveling at 70mph, how long for joe to catch bob. i need an explanation on how to get the answer.

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Question 984088: bob is 80 miles ahead moving 50mph and joe is traveling at 70mph, how long for joe to catch bob. i need an explanation on how to get the answer.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
bob is 80 miles ahead moving 50mph and joe is traveling at 70mph, how long for joe to catch bob. i need an explanation on how to get the answer.
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Joe is "gaining on" Bob at 20 mi/hr (70-50)
80/20 = 4 hours to catch.