51.   There are clear differences in speed of learning between infants at this early stage.

52.   There was the boyish enthusiasm and raw speed of Maurice Greene and the quiet, understated professionalism of the unbeatable Michael Johnson.

53.   They Simply would not have the flexibility or the speed of reaction to cope with the complexities of everyday life.

54.   This is used to indicate the clock speed of computers.

55.   What was the speed of the car at the time of the accident?

56.   With increasing multiracial societies in most countries and the speed of modern-day travel such patients are found in hospitals throughout the world.

57.   When it comes to speed of response, a small firm can outdo a big company.

58.   The aeroplane will travel at twice the speed of sound.