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Minus the 1948 speed time from the 1908 speed time. Then,dived the prvious answer by 40. Next,multiply the previous answer by 64. Finally, minus the product (from the last stage) from the 1908 by speed time and ... the 2012 time should be your answer.E.g: in 1908 the 100m fastest time was 10.8 secs and in 1948 the fastest time was 10.3 secs, so minus 10.3 from 10.8 which = 0.5 secs,
0.5 divided by 40= 0.0125,
0.0125 x 64 = 0.8,
10.8 - 0.8 = 10secs.