Time & Distance, Trains, Boats & Streams Tricks and Formulas
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Time & Distance
Suppose a man covers a distance at ‘x’ kmph and an equal distance at ‘y’ kmph, and then average speed during his whole journey is kmph
Trains

Lengths of trains are ‘x’ km and ‘y’ km, moving at ‘u’ kmph and ‘v’ kmph in the same direction, then the time taken y the overtaker train to cross the slower train is hrs

Time taken to cross each other hrs

If two trains start at the same time from two points A and B towards each other and after crossing they take a and b hours in reaching B and A respectively.


Boats & Streams

If the speed of a boat in still water is and the speed of the stream is v , then: and

If the speed downstream is a km/hr and the speed upstream is b km/hr, then: Speed in still water . and Rate of stream km/hr.