In this module we will deal with basic concepts of time and distance, speed, average speed, conversion from km/h to m/s and vice versa. This chapter will form the basis of further concept of relative speed which is used in train and boat problems.

Important Formulas

  1. Speed=Distance/Time
  2. Distance=Speed×Time
  3. Time=Distance/Speed
  4. To convert Kilometers per Hour(km/hr) to Meters per Second(m/s)
    x km/hr=(x×5)/18m/s
  5. To convert Meters per Second(m/s) to Kilometers per Hour(km/hr)
    x m/s=(x×18)/5 km/hr
  6. If a car covers a certain distance at x kmph and an equal distance at y kmph, the average speed of the whole journey = 2xy/(x+y) kmph
  7. Speed and time are inversely proportional (when distance is constant) ⇒Speed ∝1/Time (when distance is constant)
  8. If the ratio of the speeds of A and B is a : b, then the ratio of the times taken by them to cover the same distance is 1/a:1/b or b : a

Solved Examples

CGPCS Notes brings Prelims and Mains programs for CGPCS Prelims and CGPCS Mains Exam preparation. Various Programs initiated by CGPCS Notes are as follows:- [carousel-horizontal-posts-content-slider]