Bullet Train
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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1 solution
Answer is 89.84 km. Simply calculate distance traveled per minute by train as follows.
Minute 1, Speed 10Km/hr, Distance 0.17Km
Minute 2, Speed 30Km/hr, Distance 0.5Km
Minute 3, Speed 90Km/hr, Distance 1.5Km
Minute 4 to 22, Speed 270Km/hr, Distance 85.5Km
Minute 23, Speed 90Km/hr, Distance 1.5Km
Minute 24, Speed 30Km/hr, Distance 0.5Km
Minute 25, Sped 10Km/hr, Distance 0.17Km
Total Distance 89.84 Km.