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March 28, 2015

March 28, 2015

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

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**DrBob222**, Wednesday, September 26, 2007 at 8:52pmSimplify 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 8:57pm9s

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**Anonymous**, Wednesday, September 26, 2007 at 8:59pm3.6s!

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**Anonymous**, Wednesday, September 26, 2007 at 9:01pmnevermind, the previous one is correct. how would I go on about that?

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**DrBob222**, Wednesday, September 26, 2007 at 9:32pmI don't think either of your responses is correct. I don't think my hint is correct, either.

distance = rate x time

distance traveled by 40 km/hr car is

d = 40t. solve for t = d/40

distance traveled by 60 km/hr car is

d + 100 = 60t. solve for t = (d+100)/60

The times are equal. Set them equal to each other and solve for distance, then solve for time it takes for the car traveling at 60 km/h to travel d + 100.

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

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**DrBob222**, Wednesday, September 26, 2007 at 11:43pmYes, 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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