Examples 9/8
1. (a) A car travels 70 miles in 2 hours. What is its average speed?
(b) A large box-shaped arena has a rectangular floor that measures 200 feet by 150
feet, and a flat ceiling that is 50 feet above the floor. Find the area of the floor
and the volume of the arena.
(c) A light bulb has power rating 90W marked on it. What is the energy usage if the
light bulb is turned on for 2 hours?
2. You want to carpet a room that measures 10 feet by 12 feet, making an area of 120
square feet. But carpet is usually sold by the square yard rather than by the square
foot. How many square yards of carpet do you need?
3. You are preparing a vegetable garden that is 40 feet long and 16 feet wide, and you
need enough soil to fill it to a depth of 1 foot. The landscape supply store sells soil by
the cubic yard. How much soil should you order?