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06 Nov 2019, 06:26
Kudos
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D
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Difficulty:
55%
(hard)
Question Stats:
67% (02:20) correct
33%
(02:21)
wrong
based on 430
sessions
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Angelina walked 360 meters from her home to the grocery at a constant speed. She then walked 480 meters to the gym at double the speed. She spent 40 seconds less on her way from the grocery to the gym than on her way from home to the grocery. What was Angelina's speed, in meters per second, from the grocery to the gym?
A. 2
B. 3
C. 4
D. 6
E. 12
Are You Up For the Challenge: 700 Level Questions
A. 2
B. 3
C. 4
D. 6
E. 12
Are You Up For the Challenge: 700 Level Questions
06 Nov 2019, 06:39
Kudos
Bookmarks
R(t+40)=360 .... eq. 1
2Rt=480.... eq 2
Rt=240... eq 3
Substitute 3 in 1
R=3
Rate from grocery to gym is twice home to grocery
Hence; 2R= 6
Posted from my mobile device
2Rt=480.... eq 2
Rt=240... eq 3
Substitute 3 in 1
R=3
Rate from grocery to gym is twice home to grocery
Hence; 2R= 6
Posted from my mobile device
06 Nov 2019, 07:01
Kudos
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Bunuel
\(D (Grocery-Gym)/ D (Home-Gym)=480/360=4/3\)
\(4/3=Speed (Grocery-Gym) * Time(Grocery-Gym)/Speed(Home-Gym)* Time(Home-Gym)\)
\(4/3=2*(t-40)/t\)
t=120
t-40=80
Speed (Grocery-Gym)=\(480/80\)
=6
D:)
