Question 144194
if the winner won by 1sec, he also won by 28ft; because the second sprinter ran 28ft/sec


the difference in their speeds was 2ft/sec; so to get a 28ft lead, the winner must have run for 14sec (28/2)


30ft/sec for 14sec is 420ft (140yd)



using equations __ let x=distance __ d=rt __ t=d/r


x/28=(x/30)+1 __ multiplying by 420 (LCM) __ 15x=14x+420 __ x=420