Time and Distance Problem

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Time and Distance Problem

Speed: Speed is defined as the distance covered by an object in unit time.

Formula

speed = distance cover
time taken

Some Important Facts

  • Distance travelled is proportional to the speed of the object if the time is kept constant.
  • Distance travelled is proportional to the time taken if speed of object is kept constant.
  • Speed is inversely proportional to the time taken if the distance covered is kept constant.
  • If the ratio of two speeds for same distance is a:b then the ratio of time taken to cover the distance is b:a

Relative Speed

If two objects are moving in same direction with speeds of x and y then their relative speed is

Formula

(x - y)

If two objects are moving is opposite direction with speeds of x and y then their relative speed is

Formula

(x + y)

Unit Conversion

km/hr to m/sec conversion

x km/hr = x x 5 m/sec.
18

m/sec to km/hr conversion

x m/sec = x x 18 km/hr.
5

Important Shortcut Formulas

If some distance is travelled at x km/hr and the same distance is travelled at y km/hr then the average speed during the whole journey is given by

average speed

average speed = 2xy km/hr
x+y

If a person travels a certain distance at x km/hr and returns at y km/hr, if the time taken to the whole journey is T hours then the one way distance is given by

one way distance

one way distance = t xy km
x+y

If two persons A and B start their journey at the same time from two points P and Q towards each other and after crossing each other they take a and b hours in reaching Q and P respectively, then

Time and Distance Shortcut Methods

Rule 4: If the same distance is covered at two different speeds S1 and S2 and the time taken to cover the distance are T1 and T2, then the distance is given by


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