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After 1 hour the slower car will be 30 mph x 1 hour = 30 miles ahead of the faster car.
The faster car is travelling 45 mph - 30 mph = 15 mph faster than the slower car and so will cover this 30 miles in 30 miles ÷ 15 mph = 2 hours at which point it will have caught the slower car and start to over take it.
What else can I help you with?
What is the final speed of the marble at the bottom of the straight ramp and loop ramp?
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