At noon, May starts at home and drive due east at a constant speed of 60 minutes per hour for 40 minutes. He stops, gets out of the car, and takes pictures, for the next 15 minutes. He then reverses direction and drives at a constant speed of 30 miles per hour for 10 miles. What is his average speed in mph for the whole trip?

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

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The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z