Chapter 6.1, Problem 45E

a.

To determine

To find the rate of speed of khannouchi in miles per hour.

Answer to Problem 45E

The rate of speed of khannouchi in miles per hour is $12.51\text{ miles per hour}$ .

Explanation of Solution

Given information :

Khannouchi ran $26.2$ mile in $2$ hours $5$ minute and $38$ second in a marathon.

Calculation :

Distance covered is $26.2$

Total time taken is $\left(2+\frac{5}{60}+\frac{38}{60\cdot 60}\right)=\left(2+0.083+0.011\right)=2.094$

The rate of speed of khannouchi in miles per hour can be calculated as,

  $\begin{array}{l}=26.2÷2.094\left[\text{divide}\right]\\ =12.51\end{array}$

Therefore,

The rate of speed of khannouchi in miles per hour is,

  $12.51\text{ miles per hour}$

b.

To determine

To find the rate of speed of khannouchi in miles per minute.

Answer to Problem 45E

The rate of speed of khannouchi in miles per minute is $0.21\text{ miles per minute}$ .

Explanation of Solution

Given information :

Khannouchi ran $26.2$ mile in $2$ hours $5$ minute and $38$ second in a marathon.

Calculation :

The rate of speed of khannouchi in miles per hour is $12.51\text{ miles per hour}$ .

Rate of speed in miles per minute can be calculated as,

  $\begin{array}{l}=12.51÷60\left[\text{divide}\right]\\ =0.21\end{array}$

Therefore,

The rate of speed of khannouchi in miles per minute is,

  $0.21\text{ miles per minute}$

c.

To determine

To find the rate of speed of khannouchi in feet per minute.

Answer to Problem 45E

The rate of speed of khannouchi in feet per minute is $1108.8\text{ feet per minute}$ .

Explanation of Solution

Given information :

Khannouchi ran $26.2$ mile in $2$ hours $5$ minute and $38$ second in a marathon.

Calculation :

The rate of speed of khannouchi in miles per minute is $0.21\text{ miles per minute}$ .

1 mile = 5280 feet

0.21 mile = 1108.8 feet

Therefore,

The rate of speed of khannouchi in feet per minute is $1108.8\text{ feet per minute}$ .