Asked by Lisa



A woman drove to work at an average speed of 40 miles per hour and returned along the same route at 30 miles per hour. If her total traveling time was 1 hour, what was the total number of miles in the round trip?
Answered by Ms. Sue
Her average speed was 35 miles per hour. Since the round trip took her 1 hour, what was the total number of miles in the round trip?

If you post your answer, we'll be glad to check it.
Answered by Damon
went t hours at 40
went (1-t) at 30
so
40 t = 30 (1-t)
70 t = 30
t = 3/7 of an hour
distance at 40 = (3/7)(40) = 120/7
distance at 30 = (4/7)(30) = 120/7 better be the same:) check
so total distance = 240/7
Answered by Lisa


I forgot to mention that this is an SAT question of the Day and they give you options for answers. The options are:
30
30 1/7
34 2/7
35
40
Sorry if the way I put it was confusing.
Answered by Damon
240/7 = 34 2/7
not allowed to use average because distance, not time, is the same
Answered by Damon
I did not see that SAT question of the day. I usually do them.
Answered by Lisa



Oh, this question is from a while ago. They are very helpful in preparing for the SAT. Thank you for your help.
There are no AI answers yet. The ability to request AI answers is coming soon!