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Use the following data: A and B are running along a circular course of radius 7 km in opposite directions such that when they meet they reverse their directions and when they meet, A will run at the speed of B and vice-versa, Initially, the speed of A is thrice the speed of B. Assume that they start from $M_{0}$ and they first meet at $M_{1}$, then at $M_{2}$, next at $M_{3}$, and finally at $M_{4}$.

Which is the point that coincides with M0?

1. $M_{1}$
2. $M_{2}$
3. $M_{3}$
4. $M_{4}$
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$\color{green}{\text{The point that coincides with}}$ $\color{blue}{M_{0}}$  $\color{green}{\text{is}}$ $\color{red}{M_{4}}$.

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For better understanding please see: https://aptitude.gateoverflow.in/4032/cat1995-88

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