It took Vaughn 3 hours to drive to his sister's house. He took the same route on the way back home, but
this time the trip took only 2.5 hours. If Vaughn drove 10 mph faster on his return trip, how fast did he
drive on his way to his sister's house?

Michele wanted to measure the height of her school’s flagpole. she placed a mirror on the ground 48 feet from a flagpole, then walked backwards until she was able to see the top of the pole in the mirror. her eyes were 5 feet above the ground and she was 12 feet from the mirror. using similar triangles, find the height of the flagpole to the nearest hundredth of a foot.