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. A blue car passes a red car on the freeway at a relative speed of 12 mph. At the same time, a green car is traveling at 57 mph in the opposite direction. The green passes the red car with a relative
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28 votes
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A blue car passes a red car on the freeway at a relative speed of 12 mph. At the same time, a green car is traveling at 57 mph in the opposite direction. The green passes the red car with a relative speed of 126 mph. What is the speed of the blue car?

User Asachet
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1 Answer

15 votes
15 votes

Answer:

Red = 126 - 57 = 69 in positive direction

Blue = Red + 12 = 81 mph

User Rdrey
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