A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 3 years ago
you, in your new red Porsche, decide to make a 160km trip to Carolina Beach, traveling at 80km?hr. Your make a return trip at a rate of 48km?hr. What was your average speed for the entire trip?
anonymous
 3 years ago
you, in your new red Porsche, decide to make a 160km trip to Carolina Beach, traveling at 80km?hr. Your make a return trip at a rate of 48km?hr. What was your average speed for the entire trip?

This Question is Closed

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0figure out the total time, and the total distance divide the total distance by the total time

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ok it was easy but i got it wrong total distance is \(2\times 160=320\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0time going in your new red porche is \(\frac{160}{80}=2\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0how about the time returning?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ugh i don't know cause it comes out as a decimal?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0much easier (believe it or not) if you leave it as a fraction

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0in other words, take \(\frac{160}{48}\) and instead of writing it as a repeating decimal, reduce it to \(\frac{10}{3}\)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0okay so? then do i leave the other as 2? or 160/2?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0now the next job is to total up the time, in other words compute \[2+\frac{10}{3}\] leave it as a fraction

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0right and now speed is distance divided by rate

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so your final job is \[320\div \frac{16}{3}\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0So the average is 60?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0that is what i get too

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0kay good. Thank you!!

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0notice two things 1) the average speed is not the "average of the speeds" and 2) the 160 is a red herring if you really want to impress your math teacher, show that it works no matter how far you drive

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0you could drive 160 miles or 100 miles or 3,000 miles or \(m\) miles, the average will still be 60

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Okay Thank you soo much. =)

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0try it with \(m\) you get \[\frac{2m}{\frac{m}{80}+\frac{m}{48}}=60\] after some algebra
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.