To find out how many complete hours Mario will bike, we need to calculate the total distance he needs to cover first. The distance from the park entrance to the mountain is not given in the question, so we will need to assume or be provided with that distance to solve the problem accurately.
Once we have the total distance, we can use the formula:
Time = Distance ÷ Speed
Let's say the total distance from the park entrance to the mountain is 21 miles.
Substitute the values into the formula:
Time = 21 miles ÷ 7 miles per hour
Time = 3 hours
Therefore, if Mario bikes at a rate of 7 miles per hour and the total distance is 21 miles, he will bike for 3 complete hours to reach the mountain.