TIME AND DISTANCE ...[competitive. exam prep.... topic 2]

TIME AND DISTANCE (Basic concepts)
1. Distance = Speed * Time

2. Time = Distance / Speed

3. Speed = Distance/Time

4. To convert speed in km/h to m/sec, multiply it with 5/18.

5. To convert speed in m/sec to km/h , multiply it with 18/5.

6. If a body travels from point A to point B with a speed of 'p' and back to point A (from point with a speed of ‘q’, then the average speed of the body is:
= 2pq/(p+q).

7. If a car does a journey in 'T' hrs, the first half at 'p' km/hr and the second half at 'q' km/hr. The total distance covered by the car = (2 * Time * p * q ) / (p + q).

8. If a body covers part of the journey at speed p and the remaining part of the journey at a speed q and the distances of the two parts of the journey are in the ratio m : n, then the average speed for the entire journey is:
= (m+n) pq / (mq+np).

9. If a person travelling between two points reaches ‘p’ hours late (If time is given in minutes, it should be converted into hrs by dividing it by 60) travelling at a speed of 'a' km/hr and reaches 'q' km/hr and reaches q hours early travelling at 'b' km/hr, the distance between the two points is:
= (ab/a‐b)(p‐q)

10.If a person goes from 'A' to 'B' at a speed of 'p' kmph and returns at a speed of 'q' kmph and takes 'T' hours in all, then the distance between the A and B:
= Total time taken * (Product of the two Speeds / Addition of the two speeds)

11. If two persons A and B start at the same time in opposite direction from two points and after passing each other they complete the journeys in 'a' and 'b' hrs respectively, then A's speed : B's speed= Square root of b : Square root of a.

12. If A travels certain distance at the rate of 'S1' kmph and B covers the same distance at the rate of 'S2' kmph and if one of them takes 't' minutes longer than the other, then:Distance covered = {(S1 x S2) x Difference in time to cover the distance} / (S1‐S2)

Note :‐ If speed is given kmph and time is given in minutes, then time is to be expressed in hrs. before solving the problem using this formula.

Comments

Post a Comment

Popular posts from this blog

NITI AYOG......................

Image
NITI Ayog :- The Government has replaced Planning Commission with a new institution named NITI Aayog (National Institution for Transforming India). A cabinet Resolution issued today gave details of the new institutions.  The institutional framework of government has developed and matured over the years.   This has allowed the development of domain expertise which allows us the chance to increase the specificity of functions given to institutions.  Specific to the planning process, there is a need to separate as well as energize the distinct ‘process’ of governance from the ‘strategy’ of governance. 1). Fullform of NITI Ayog Ans- National Institution for Transforming India Aayog 2). National Institution for Transforming India Aayog replaces- Ans-Planning Commission 3). NITI Ayog was formed on Ans-1 January 2015 4).Chairperson of : NITI Ayog Ans-Prime Minister of India 5).Who is the Present Chairperson of NITI Ayog Ans- Prime Minister Narendra Modi 6). V...
Read more

Coding and Decoding ...........[competitive. exam prep.... topic 20]

Image
Coding is a system of signals. This is a method of transmitting information in the form of codes or signals without it being known by a third person. The person who transmits the code or signal, is called the sender and the person who receives it, is called the receiver. Transmitted codes or signals are decoded on the other side by the receiver—this is known as decoding. Most competitive exams have a dedicated section of Coding –Decoding in Reasoning or Mental Ability. Many of students and readers find difficulty to solve questions based on Coding – Decoding in Mental Aptitude. The Coding and Decoding Test is set up to judge the candidate’s ability. Coding and decoding tips are very useful to those who are preparing for the attending the bank exam IBPS, SBI, LIC AAO, UPSC, IAS, CAT, XAT, MAT, SSC, GATE, and other competitive exams. We have also published the Solved examples for the coding and decoding aptitude. Coding is a process of sending a message from master to slave that ...
Read more

LANGUAGES IN INDIA .............................

Image
* The Indian language known as the '' Italian of the East '' is : Telugu * The number of languages recognised by the Indian Constitution is : 22 * At the inception of Indian constitution in 1950, the number of recognised languages was : 14 * The languages which were added to the Eighth Schedule are : Sindhi, Konkani, Nepali, Manipuri, Maithili, Dogri, Bodo and Santhali. * Number of identifiable mother tongues as per Ministry of Statistics and Programme Implementation report of 2011 : 234 * The first language to be conferred the status of a Classical Language : Tamil * Other languages which have been conferred the status of a Classical Language : Sanskrit, Kannada, Malayalam, Telugu and Odia * Only state having official language English is : Nagaland * The official language of the Supreme Court and High Court as prescribed by the Constitution of India is : English * The principal languages of Lakshdweep are : Jeseri (DweepBhasha) and Mahal * Foreign language com...
Read more