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Two cars travel from different locations at constant speeds. To meet each other after starting at the same time, they take $1.5$ hours if they travel towards each other, but $10.5$ hours if they travel in the same direction. If the speed of the slower car is $60 \mathrm{~km} / \mathrm{hr}$, then the distance traveled, in $\mathrm{km}$, by the slower car when it meets the other car while traveling towards each other, is

  1. $100$
  2. $90$
  3. $150$
  4. $120$
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