A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing


  • 4 years ago

Lisa drives to post-office at 40 miles per hour and returns though the same route at 50 miles per hour. If the return trip takes 15 minutes shorter, how long is the trip to the post office?

  • This Question is Closed
  1. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    We know the equation v = d /t Let d be the distance she travels, and is the same on the way there and back. For the first trip, 1) 40 = d / t Let t be the time she needs to take to get to the post office And for the second trip, 2) 50 = d / t -15 Isolating for d, 1) d = 40t 2) 50(t-15) = d Equating 1) and 2): We get 40t = 50(t-15) Solving for t gets you the time it takes for her to get to the post office

  2. dumbcow
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Just a note: since speed is in mph, time must be in units of hours 40t = 50(t-.25)

  3. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...


  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.