Look at this record in walking at the 4th Military World Games being held at Hyderabad, India. (and this may not be the world record in this category...)
The results: Athletics: Men: 20km walk: 1 Cui Zhide (Chn) 1h 25m 23.7s, 2. Trotski Ivan (Bel), 3. Toth Matei (Slo).Cui Zhide of China walked away with a Gold after walking 20 kms in 1:25:23. He had walked at a speed of over 14km an hour. I can't do that speed even running, let alone walking.
Only 46 days to go for Singapore Marathon and my target is to complete the full marathon under 4:30. If I can consistently do 10 km an hour.. then I can attain this target.