27219

3 easy steps to finding the answer

100m=0.5x1 1/2=0.75
200m=1.5x1 1/2=2.25
400m=3.8x1 1/2=5.7
800m=3.0x1 1/2=4.5
1500=11.0x1 1/2=16.5

overall answer/result

100m 10.3-0.75=9.55
200m 21.1-2.25=18.85
400m 46.2-5.7=4.50
800m 109-4.5=10.45
1500m 229-16.5=212.50

explanation

First i looked at the times for 1908 and 1948 and then found the difference between them.With those answers i realised there was a 40 year difference between 1908 and 1948, therefore there is approximately 1 1/2 times between 1948 and 2012 (64 years), so then i timesed my answers by 1 1/2 and found the answers to them.Next i took those answers away from the 1948 times to give me my final estimated answer/result as shown above!