Chapter 12.7, Problem 32STP

To determine

Calculate the average speed of the car.

Answer to Problem 32STP

The average speed is $56.67mile/hour$ and the correct option is J.

Explanation of Solution

Given:

It is given in the question that a car travel $50$ miles due north in one hour and $120$ miles due west in two hours.

Concept Used:

In this, use the concept of average speed and the formula used is $Avg.Speed=\frac{inital+final}{totaltime}$ .

Calculation:

Here,

Initial distance = $50$ miles , Final distance = $120$ miles

Total time taken = $2+1=3hour$ .

  $\begin{array}{l}Avg.Speed=\frac{inital+final}{totaltime}\\ Avg.Speed=\frac{50+120}{3}\\ Avg.Speed=\frac{170}{3}\\ Avg.Speed=56.67mile/hour\end{array}$

The correct option will be J.

Conclusion:

The correct option will be J.