Here's a link to an interesting calculator... http://www.wallaceracing.com/60-footmph.php You enter your 60' time and it tells you how fast you're going at the 60' mark, faster than you might think.
There's a bunch of useful calculators on that site... http://www.wallaceracing.com/Calculators.htm
There's a bunch of useful calculators on that site... http://www.wallaceracing.com/Calculators.htm