Problema Solution
Tommy drove 40 mph to his grandmother's house one day. When he came home he took the same route but drove 45 mph. He drove a total of four hours. How many miles did he drive that day?
Answer provided by our tutors
solution:
d = rt
t = d/r
4 = d/40 + d/45
1440 = 9d + 8d = 17d
d = 1440/17 miles
d =~ 84.7 miles