Sandy left downtown Durham, and three hours later, Mary left going 46 mph faster to catch up. After another two hours, Mary caught up. Find Sandy's average speed.
Accepted Solution
A:
Answer: 30 2/3 mphStep-by-step explanation:Going 46 mph faster for 2 hours, Mary closed a (46 mi/h)×(2 h) = 92 mile gap. That gap was created in 3 hours by Sandy going ... (92 mi)/(3 h) = 30 2/3 mi/hSandy's average speed was 30 2/3 mph._____Comment on the situationWe wonder what sort of road and traffic situation would allow Mary to go 76 2/3 mph in downtown Durham, while Sandy traversed the same route at 30 2/3 mph.