andys average driving speed for a 4-hour trip was 45 miles per hour. during the first 3 hours he drove 40 miles per hour. what was his average speed for the last hour of his trip?

The trip length was 4 x 45 = 180 miles. He went 3x40 = 120 the first three hours. How many miles does that leave for the last hour?

4+5

A car driver completes a 180km trip in 4hour. If he averages 50km/h during the first 3 hour of t

To find the remaining distance for the last hour, subtract the distance covered in the first three hours from the total distance of the trip.

Total distance of the trip = 180 miles
Distance covered in the first three hours = 3 hours * 40 miles per hour = 120 miles

Remaining distance for the last hour = Total distance of the trip - Distance covered in the first three hours
= 180 miles - 120 miles
= 60 miles

Therefore, the remaining distance for the last hour is 60 miles.

To find the average speed for the last hour of Andy's trip, we can use the formula:

Average Speed = Total Distance / Total Time

We already know that Andy drove for 4 hours and his average speed for the entire trip was 45 miles per hour. Therefore, the total distance for the trip can be calculated by multiplying the average speed by the total time:

Total Distance = Average Speed x Total Time
Total Distance = 45 mph x 4 hours
Total Distance = 180 miles

Next, we need to determine how far Andy traveled during the first 3 hours. We know that his speed during the first 3 hours was 40 mph, so we can calculate the distance traveled:

Distance Traveled during first 3 hours = Speed x Time
Distance Traveled during first 3 hours = 40 mph x 3 hours
Distance Traveled during first 3 hours = 120 miles

Now, to find out how many miles Andy traveled during the last hour, we can subtract the distance traveled during the first 3 hours from the total distance:

Miles Traveled in the last hour = Total Distance - Distance Traveled during first 3 hours
Miles Traveled in the last hour = 180 miles - 120 miles
Miles Traveled in the last hour = 60 miles

Therefore, Andy's average speed for the last hour of his trip was 60 miles per hour.