A bullet train takes 25 minute to cover two station.

Speed of train is constant in each minute.

It starts journey at 10 km/hr.

After every minute it increases its speed by 200%.

After end of 4th minute it reaches at its full speed and maintain it till the end of 22nd minute.

After which it keeps reducing its speed to 1/3 of its current speed for every minute till end of 25th minute at which its speed is reduced to 10 km/hr again.

What is distance between two stops (in km) ??

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