Question



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?
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.
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


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.
240/7 = 34 2/7
not allowed to use average because distance, not time, is the same
I did not see that SAT question of the day. I usually do them.



Oh, this question is from a while ago. They are very helpful in preparing for the SAT. Thank you for your help.

Related Questions

This is an SAT prep question. A woman drove to work at an average speed of 40 miles per hour and... There was terrible traffic on the highway, and Kiran drove to work at 15 miles per hour. How fast wo... Seetha drove to work at 30 miles per hour. How fast would she need to drive home for the average spe... On a business trip, Kerry drove 180 miles in 3.0 hours. What was his average speed? Group of answer...