can someone please help me figure out how to solve this problem?

TiaB

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Oct 7, 2011
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Adam and David were both driving east on the same highway. At 5pm, Adam traveling at 55 mies per hour was 20 miles east of David. A little later, David, traveling at 65 miles per hour, passed Adam. At what time did David pass Adam?
 
Adam and David were both driving east on the same highway. At 5pm, Adam traveling at 55 mies per hour was 20 miles east of David. A little later, David, traveling at 65 miles per hour, passed Adam. At what time did David pass Adam?

Assumption: Adam and David are driving at constant speed of 55 mph and 65 mph, respectively.

What is the relative velocity of David wrt Adam?

With that relative velocity, how much time would David take to make the distance between him and Adam to zero?
 
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