If an express train travels 2.5 miles in 5 minutes, what is its average speed in MPH?

To determine the average speed of the express train, we need to calculate how far it travels in an hour, given that it travels 2.5 miles in 5 minutes.

First, we convert the travel time from minutes to hours. Since there are 60 minutes in an hour, 5 minutes is equal to 5/60 hours, which simplifies to 1/12 hours.

Next, we can use the formula for average speed, which is distance divided by time. The distance traveled is 2.5 miles, and the time taken is 1/12 hours.

Using the formula:

Average speed = Distance / Time Average speed = 2.5 miles / (1/12 hours)

To divide by a fraction, we multiply by its reciprocal:

Average speed = 2.5 miles × (12/1) Average speed = 2.5 × 12 = 30 miles per hour.

Therefore, the average speed of the express train is 30 miles per hour, making this the correct answer.