Find the rate on the basis of the information provided. Use a calculator and round your answers to the nearest hundredth. All events were at the 2008 Olympics. (Source: World Almanac and Book of Facts.)

| Event | Participant | Distance | Time |
39. | 100-m hurdles, women | Dawn Harper, USA | 100 m | 12.54 sec |
40. | 400-m hurdles, women | Melanie Walker, Jamaica | 400 m | 52.64 sec |
41. | 400-m hurdles, men | Angelo Taylor, USA | 400 m | 47.25 sec |
42 | 400-m run, men | LaShawn Merritt, USA | 400 m | 43.75 sec |
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