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Car A began a journey from a point at 9 am, traveling at 30 mph. At 10 am car B started
traveling from the same point at 40 mph in the same direction as car A. At what time will car B
pass car A?
Solution
* After t hours the distances D1 traveled by car A is given by
D1 = 40 t
* Car B starts at 10 am and will therefore have spent one hour less than car A when it passes it.
After (t - 1) hours, distance D2 traveled by car B is given by
D2 = 60 (t-1)
* When car B passes car A, they are at the same distance from the starting point and therefore D1
= D2 which gives
40 t = 60 (t-1)
* Solve the above equation for t to find
t = 3 hours
* Car B passes car A at
9 + 3 = 12 pm is the answer.
Car A began a journey from a point at 9 am- traveling at 30 mph- At 10.docx

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Car A began a journey from a point at 9 am- traveling at 30 mph- At 10.docx

  • 1. Car A began a journey from a point at 9 am, traveling at 30 mph. At 10 am car B started traveling from the same point at 40 mph in the same direction as car A. At what time will car B pass car A? Solution * After t hours the distances D1 traveled by car A is given by D1 = 40 t * Car B starts at 10 am and will therefore have spent one hour less than car A when it passes it. After (t - 1) hours, distance D2 traveled by car B is given by D2 = 60 (t-1) * When car B passes car A, they are at the same distance from the starting point and therefore D1 = D2 which gives 40 t = 60 (t-1) * Solve the above equation for t to find t = 3 hours * Car B passes car A at 9 + 3 = 12 pm is the answer.