If the distance between two cities is 140 miles what is the

If the distance between two cities is 140 miles, what is the distance in kilometers?

Solution

the answer to your question:
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1 mile = 1.609344 kilometers
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1 kilometer = 1/1.609344 = .6213711922373... miles.
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rounded to the nearest hundredth, these equations become:
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1 mile = 1.61 kilometers
1 kilometer = .62 miles
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140 miles times 1.61 kilometers per mile = 225.4 kilometers.
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going in reverse, 225.4 kilometers times .62 miles per kilometer = 139.748 miles
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the rounding leads to some errors going back and forth so if you want to get real accurate you should go out more than 2 decimal places.
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when going from kilometers to miles, the most accurate is to divide by 1.609344 since this eliminates any rounding errors, no matter how small, since it appears that the 1.609344 factor is a discrete number that doesn\'t go on endlessly.