# Moving Locomotive Problem

A moving locomotive problem normally poses the challenge of finding out the time taken, the speed, or the distance covered while a particular object pass another. The moving locomotive can be a train, a car, a flight etc. and the objects can be a truck, a man, a platform, a pole, a bridge, a tunnel, a stationary train, a moving train etc.

A moving locomotive is said to have crossed or passed an object (stationary or moving) only when the total length of the moving locomotive crosses the total length of the object.

For instance, for a train to cross an object,

Distance covered by the train = length of train + length of object.

### Important Facts, Tips and Shortcuts for Calculation

• km/hr. to m/s conversion:
• x km/hr = (x × ) m/s
• m/s to km/hr. conversion:
• x m/s = (x ×  ) km/hr
• Speed =
• Suppose two objects are moving in the same direction at u m/s and v m/s, where
u ˃ v, then their relative speed = (u – v) m/s.
• Suppose two objects are moving in opposite directions at u m/s and v m/s, then their relative speed = (u + v) m/s.

“For detailed theory, refer the book “CSIR-NET General Aptitude – A New Outlook”

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