Wednesday, 6 September 2017

TIME DISTANCE AND TRAIN NOTE BY RAKESH YADAV SIR

Problems on trains are very common in competitive exams. Various types of questions are asked on trains. Questions on trains are solved using the concept of time, speed and distance i.e. we use the formulas of time, speed and distance to solve questions on trains.




Given below is a list of some important points that need to be kept in mind while solving questions on trains.

Important Points

When two trains are going in the same direction, then their relative speed is the difference between the two speeds.
When two trains are moving in the opposite direction, then their relative speed is the sum of the two speeds.

COMPOUND INTEREST HAND WRITTEN NOTE BY RAKESH YADAV SIR
When a train crosses a stationary man/ pole/ lamp post/ sign post- in all these cases, the object which the train crosses is stationary and the distance travelled is the length of the train.

When it crosses a platform/ bridge- in these cases, the object which the train crosses is stationary and the distance travelled is the length of the train and the length of the object.

PROFIT AND LOSS HAND WRITTEN NOTE BY RAKESH YADAV SIR
When two trains are moving in same direction, then their speed will be subtracted.

When two trains are moving in opposite directions, then their speed will be added.
In both the above cases, the total distance is the sum of the length of both the trains.

MATHS CLASS NOTES 1 & 2 BY RAKESH YADAV SIR
When a train crosses a car/ bicycle/ a mobile man- in these cases, the relative speed between the train and the object is taken depending upon the direction of the movement of the other object relative to the train- and the distance travelled is the length of the train.

ALLIGATION AND MIXTURE HAND WRITTEN NOTE BY RAKESH YADAV SIR

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