+0  
 
0
107
3
avatar

Audrey rode her bike to school at a rate of 12mi/hr. She rode back at a rate of 8mi/hr. How far is it to school if the round trip takes 1 hour?

Guest Jun 12, 2018
 #1
avatar+45 
0

Let us have d= the distance from home to school. Then the time at 12mi/hr is 5d because 12/60=1/5. Similarily 8/60=2/15 so it takes 15/2*d. Adding the times gives us 12.5d=60 so d=4.8mi. Thus it takes 4.8mi to school.

Alecdanub  Jun 12, 2018
 #2
avatar
0

Let the distance = D

 

Average speed = Distance travelled / Time

Time = Distance / speed

D/12  +  D/8 = 1 hour, solve for D

[2D  +  3D]  / 24 = 1 hour                 cross multiply

5D = 24                                                 divide both sides by 5

D = 24/5

D = 4.8 miles - the distance from her home to shchool.

Guest Jun 12, 2018
 #3
avatar
0

thank yousmiley

Guest Jun 12, 2018

12 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.