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OpenStudy (rachelreynolds393):
A blue car passes a red car on the freeway at a relative speed of 12 mph. At the same time, a green car is traveling at 57 mph in the opposite direction. The green passes the red car with a relative speed of 126 mph. What is the speed of the blue car?
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OpenStudy (jiteshmeghwal9):
\[v_{b,r}=v_b-v_r=12 mph \] \[v_{g,r}=v_g-v_r=126 mph \] \[v_g=57 mph \]
OpenStudy (irishboy123):
|dw:1476308660511:dw| not so sure, mate
OpenStudy (irishboy123):
just tweak them
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