Chapter 6, Problem 2MCQ

To determine

To calculate:thespeed of car in miles per hour.

Answer to Problem 2MCQ

The speed of car in miles per hour is $30$ .

Explanation of Solution

Given information : consider, thespeedprovided in the question,

  $44feet/\sec ond$ .

Formula used :cross product property −

  $\begin{array}{l}\frac{a}{b}=\frac{c}{d}\\ ab=cb\\ \end{array}$

Calculation : to find the speed of car, first convert it into proportion then use the cross product property.

We know that,

  $1mile=5280feet$

  $1hour=3600\sec ond$

Let x be the speed in miles per hour of car,

  $\frac{44feet}{\sec ond}=x\frac{miles}{hour}$

  $\begin{array}{l}\frac{44feet}{\sec ond}=x\frac{5280feet}{3600\sec ond}\\ 44·3600=x·5280\\ x=30\end{array}$

Hence,

Thus,The speed of car in miles per hour is $30$ .