A community for students.
Here's the question you clicked on:
 0 viewing
toxicsugar22
 5 years ago
Andy drives 300 miles to Lake Tahoe at 70 miles per hour and returns home at 50 mph. What is his average speed for the round trip. (It is not 6o miles per hour.)
Write expressions for the time it takes for each leg of the trip if Andy drives a distance d, at speed r base 1 and returns at speed r base 2
toxicsugar22
 5 years ago
Andy drives 300 miles to Lake Tahoe at 70 miles per hour and returns home at 50 mph. What is his average speed for the round trip. (It is not 6o miles per hour.) Write expressions for the time it takes for each leg of the trip if Andy drives a distance d, at speed r base 1 and returns at speed r base 2

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0300/70 is the total time to get out there. 300/50 is the total time to get back. In variables, distance = 300 speed out = r1 speed back = r2 so you have [(d/r1)+(d/r2)]/2

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0er, I don't think that's right actually...d/r1 gives the amount of time it takes to go out, d/r2 gives the amount of time it takes to come back. To find the average, you need the total distance traveled (d*2) divided by the total time it took (d/21+d/r2)

toxicsugar22
 5 years ago
Best ResponseYou've already chosen the best response.0I dont think the total time is right

toxicsugar22
 5 years ago
Best ResponseYou've already chosen the best response.0r u sure its right

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0300mi/70mph = 4.286 hours to get there 300mi/50mph = 6.00 hours to get back Total time traveled = 4.286 + 6.000 = 10.286 hours Total distance traveled = 300*2 = 600 mi Average speed = distance/time = 600/10.286 = 58.33mph
Ask your own question
Sign UpFind more explanations on OpenStudy
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...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 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.