If a car travels 150 miles in 3 hours, what is its speed in miles per hour?

To determine the speed of the car in miles per hour, you need to divide the total distance traveled by the total time taken. In this scenario, the car travels a distance of 150 miles in 3 hours.

You can calculate the speed using the formula:

[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} ]

Plugging in the values:

[ \text{Speed} = \frac{150 \text{ miles}}{3 \text{ hours}} = 50 \text{ miles per hour} ]

Therefore, the speed of the car is 50 miles per hour, which corresponds to the selected answer. This means that the car covers a distance of 50 miles in one hour. This type of calculation is essential in understanding concepts of rate and motion in mathematics, particularly in elementary education where students learn to apply formulas to solve real-world problems.