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Now and Then

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

In $1908$ the Olympic Games were held in London, that's just over $100$ years ago. Then, just after World War $2$ they were again in London in $1948$

Here are the results from some track events;

$1908$

$100$ metres $10.8$ secs

$200$ metres $22.6$ secs

$400$ metres $50.0$ secs

$800$ metres $112$ secs

$1500$ metres $240$ secs

$1948$

$100$ metres $10.3$ secs

$200$ metres $21.1$ secs

$400$ metres $46.2$ secs

$800$ metres $109$ secs

$1500$ metres $229$ secs


The 2012 London Olympics were another 64 years later.
How did the results differ?
Could you have predicted the results?
Perhaps more importantly, what's the reason for your answer?