http://www.metric-conversions.org/cgi-bin/util/convert.cgi
http://www.unitconversion.org/time/seconds-to-hours-conversion.html
http://www.machinehead-software.co.uk/bike/speed_distance_time_calc.html
http://www.springfrog.com/converter/decimal-time.htm
http://www.youtube.com/watch?v=4c5wsAvVak4
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