Mathematics
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OpenStudy (anonymous):
Two cars leave Denver at the same time and travel in opposite direction. one car travels 5mi/h faster that the other car. The care are 575 mi apart in 5 hours. How fast is each car traveling? 2nd attempt for this question...
14 years ago
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OpenStudy (saifoo.khan):
So we got it wrong last time? :o
14 years ago
OpenStudy (anonymous):
the answer i got was not any of the options for the multiple choices
14 years ago
OpenStudy (saifoo.khan):
Oh. let me try..
14 years ago
OpenStudy (anonymous):
thx
14 years ago
OpenStudy (saifoo.khan):
@yummydum did it wrong.
14 years ago
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OpenStudy (anonymous):
i got it...gimme a sec
14 years ago
OpenStudy (saifoo.khan):
He didn't used the total time in his solution.
14 years ago
OpenStudy (anonymous):
what formula did u come up with?
14 years ago
OpenStudy (anonymous):
\[d_1=5r\]\[d_2=5(r+5)\implies d_2=5r+25\]\[d_1+d_2=575\] \[5r+5r+25=575\]\[10r=550\]\[r=55\]
\[d_1=55mph\]\[d_2=60mph\]
14 years ago
OpenStudy (anonymous):
@justinsmom better?
14 years ago
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OpenStudy (anonymous):
ok thats one of the options... hope he can figure other two out with info i got earlier... thanks again
14 years ago
OpenStudy (anonymous):
k
14 years ago
OpenStudy (saifoo.khan):
I don't get it @yummydum , explain.
14 years ago
OpenStudy (anonymous):
kyun bhai??
14 years ago
OpenStudy (saifoo.khan):
5r+25?
14 years ago
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OpenStudy (anonymous):
\[5(r+5)\implies 5r+25\]
14 years ago
OpenStudy (anonymous):
since the second car is traveling 5mph faster than the first
14 years ago
OpenStudy (saifoo.khan):
why multiply it by 5?
14 years ago
OpenStudy (anonymous):
because that is the value of t(time)....t=5hrs
14 years ago
OpenStudy (saifoo.khan):
So?
14 years ago
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OpenStudy (anonymous):
the formula is
d=rt
d=r5
14 years ago
OpenStudy (anonymous):
that is for the first car and the second car is 5 plus the rate so that makes it d=(r+5)5
14 years ago
OpenStudy (saifoo.khan):
how about?
\[Speed = \frac{distance}{time}\]\[r+r+5 = \frac{575}{5}\]
14 years ago
OpenStudy (saifoo.khan):
Ah, same thing. Mine's easier..
14 years ago
OpenStudy (anonymous):
yea thats the same thing
2r+5=115
2r=110
r=55
14 years ago
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OpenStudy (saifoo.khan):
Still, mine's easier.
14 years ago
OpenStudy (anonymous):
yes..it is...khush?
14 years ago
OpenStudy (saifoo.khan):
```
yummydummy
14 years ago
OpenStudy (anonymous):
o.O
14 years ago
OpenStudy (saifoo.khan):
```
heck yeah! :D
14 years ago
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OpenStudy (anonymous):
umm...theek tou ho...aik dum kya hua? :P
14 years ago
OpenStudy (saifoo.khan):
Lol, kuch nahi hua bhai. Sab waisa he hai.
14 years ago
OpenStudy (anonymous):
acha
14 years ago