18. A hiker averaged 4 miles per hour walking up the long hill to the Castle of Wizdom. She averaged 6 miles per hour walking back down the hill by the same route. What was her overall average miles per hour for the round trip?
5. Trophius can apply 3 gallons of gilt per hour when gilding the roofs of the castle towers. He only buys gilt in 5-gallon containers. What is the minimum number of containers he needs to buy for an 8-hour work day? (“Gilt” is the liquid gold that is applied instead of paint to my roof.)
7. It turns out that Darrell’s “Fire-breathing Rubberburner” has a few problems with its speedometer. It registers how many seconds it takes to go one mile. How many miles per hour is he going if the speedometer registers 75 seconds per mile?
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