Question 1020740
Let {{{ s }}} = John's speed in m/sec
{{{ 3s }}} = Tim's speed in m/sec
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 {{{ t = 50/(3s) }}} = Tim's time in seconds for 
a 50 m race
In that amount of time, John's distance is:
{{{ s*( 50/(3s) ) = 50/3 }}} m
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{{{ 50 - 50/3 = (2/3)*50 }}}
{{{ (2/3)*50 = 100/3 }}}
Tim beats John by 33 and 1/3 m in a 50 m race