How do you write an equation for this? ( Algebra 1)
Favorites|Homepage
Subscriptions | sitemap
HOME > Mathematics > How do you write an equation for this? ( Algebra 1)

How do you write an equation for this? ( Algebra 1)

[From: ] [author: ] [Date: 11-11-17] [Hit: ]
2.18/t(t-1,v= 18/t ==> v=18/3 = 6 miles/h ----> usual speed-If half the speed is 90 minutes, then the time she would take with the usual speed is 180 minutes.The usual speed is 6 miles per hour and normally she would take 3 hours to run 18 miles. If she doubles her speed (12 miles) she would take 1 hour and 30 minutes (90 minutes less than with her usual speed).......
MEI runs an 18 miles course at a constant speed. If she doubles her usual speed, she can complete the course in an hour and a half less than her usual time. what is Mei's usual speed and her usual time to complete the course?

-
At her usual speed:

v.t =18 (1)

If she doubles her speed:

2v( t-1,5)=18 (2)

From (1) v =18/t (3)

Substituting (3) in (2):

2.18/t(t-1,5) = 18

36 - 54/t = 18

36t -54 = 18t

18t=54

t= 3 hs ----> usual time

v= 18/t ==> v=18/3 = 6 miles/h ----> usual speed

-
If half the speed is 90 minutes, then the time she would take with the usual speed is 180 minutes.
180 minutes = 18 miles
Divide everything by 3 to get 60 minutes (MPH)
60 Minutes = 6 Miles

The usual speed is 6 miles per hour and normally she would take 3 hours to run 18 miles. If she doubles her speed (12 miles) she would take 1 hour and 30 minutes (90 minutes less than with her usual speed).
1
keywords: an,Algebra,this,you,How,do,for,write,equation,How do you write an equation for this? ( Algebra 1)
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .