Rounding lower and upper bounds Word problem

Question

A car travels for 290 miles in 5 hours 45 minutes. The distance was rounded to the nearest five miles and the time was rounded to the nearest 15 minutes. What is the upper bound for the average speed of the car? Give your answer in miles per hour to three significant figures.

Answer 1

1. The distance was already rounded to the nearest 5 miles, 290.
2. The time was rounded to the nearest 15 minutes, a total of 5 hours and 45 minutes.
3. This converts to 5.75 hours.
4. 290 miles/ 5,75 hours = 50.4 miles per hour