1. A substance weighs 37.3 g. It was dropped into a graduated cylinder that reads 38.07 mL. After adding the object the reading on the cylinder was 90.38 mL. What is the density of the object?

2. An SUV average 18 miles per gallon. How many gallons of gas does it need to go 525 km?

3. Secretariat ran the 1.25 mile Kentucky derby in 1 minute and 59 seconds. What was his average speed in meters per hour ?