A car travels 255 miles in 3 hours and 45 minutes. How many miles does it travel per hour? miles per hour Explanation Check

Step 1 ：Convert the time to hours: 3 hours and 45 minutes = 3 + \(\frac{45}{60}\) = 3.75 hours

Step 2 ：Calculate miles per hour: \(\frac{255}{3.75}\) = 68

Step 3 ：\boxed{68}