Miles per hour be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball. Miles per hour Miles per hour (abbreviated mph, MPH or mi/h) is an imperial and United States customary unit of speed expressing the number of statute miles covered in one hour. It is used in the United States, United Kingdom and many Commonwealth nations, particularly in the Caribbean region. Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions (elsewhere kilometers per hour are used): Road traffic speeds in other countries are indicated in
Jimmy Doolittle first quantities of 100 octane aviation gasoline. High octane fuel was crucial to the high-performance planes that were developed in the late 1930s. In 1931, Doolittle won the first Bendix Trophy race from Burbank, California, to Cleveland, in a Laird Super Solution biplane. In 1932, Doolittle set the world's high speed record for land planes at 296 miles per hour in the Shell Speed Dash. Later, he took the Thompson Trophy race at Cleveland in the notorious Gee Bee R-1 racer with a speed averaging 252 miles per hour. After having won the three big air racing trophies of the