Posted by **Anonymous** on Wednesday, September 26, 2007 at 8:44pm.

How long does it take an automobile traveling in the left lane at 60.0 km/h to overtake (become even with) another car that is traveling in the right lane at 40.0 km/h when the cars’ front bumpers are initially 100 m apart?

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**DrBob222**, Wednesday, September 26, 2007 at 8:52pm
Simplify the question. How long does it take a car traveling at 60 km/h to travel 100 m?

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**Anonymous**, Wednesday, September 26, 2007 at 8:57pm
9s

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**Anonymous**, Wednesday, September 26, 2007 at 8:59pm
3.6s!

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**Anonymous**, Wednesday, September 26, 2007 at 10:31pm
Aren't you suppose to convert km to m (since the distance is in m)?

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**DrBob222**, Wednesday, September 26, 2007 at 11:43pm
Yes, you may convert 100 m to 0.1 km in which case d will be in km or you may convert 40 km/h and 60 km/h to m/h and d is then in meters. However, since both 40 km/h and 60 km/h are on opposite sides of the equation, the conversion factor cancels and what I set up above gives the same answer with or without the conversion. Probably the math people won't like that because it isn't good math and I recommend the conversions.

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