Chapter 3, Problem 22CRP

Explanation of Solution

Determine how much time would pass between each character:

A typist type sixty words per minute, that is $60\text{words}=60\text{seconds}$. The number of characters in each word is five, that is $\text{1}\text{word}=5\text{characters}$.

• To find the number of words per second, divide sixty words by 60 seconds as shown below:

  $\begin{array}{c}\text{Number}\text{of}\text{words}\text{per}\text{second}=\frac{60}{60\text{s}}\\ =1\end{array}$

• Thus, if typist types sixty words per minute, then the number of words per second is one.
• To find the number of seconds per instruction, divide one second by five.

$\begin{array}{c}\text{Number}\text{of}\text{seconds}\text{per}\text{character}=\frac{1}{5}\\ =0.2\text{seconds/character}\end{array}$

• To represent the above result in time slice, convert seconds into milliseconds by multiplying the result by 1,000.

$\begin{array}{l}=0.2\text{seconds}\text{per}\text{character}\times 1,000\\ =\text{ 2}00\text{ milliseconds/character}\end{array}$

Therefore, the time that would pass between typing each character is $200milli\sec onds/character$