A boat travels 90 miles downstream in 3 hours. What is its average speed?

To determine the average speed of the boat, you need to use the formula for average speed, which is the total distance traveled divided by the total time taken. In this case, the boat travels 90 miles downstream in 3 hours.

Calculating the average speed:

Average Speed = Total Distance / Total Time

Average Speed = 90 miles / 3 hours = 30 miles per hour.

This calculation shows that the average speed of the boat during its journey downstream is indeed 30 mph, which is why this answer is correct. Understanding average speed as a simple ratio of distance divided by time is crucial and helps in solving similar problems in the future.