Time And Distance
Posted by
Ravi Kumar at Monday, July 6, 2009
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Distance
Distance covered per unit time is called speed
Speed = Distance/Time
Time = Distance/speed
Distance = speed*time
Distance is normally measured in Km, meters or miles; Time in hours or seconds and speed in km/hr, miles/hr, meter/second.
1km/hr = 5/18 m/s
1 m/s = 18/5 Km/hr
If the ratio of the speed of A and B is a:b,then the ratio of the time taken by them to cover the same distance is 1/a : 1/b or b:a
Relative Speed
suppose a man covers a distance at x kmph and an equal distance at y kmph.then the average speed during the whole journey is (2xy/x+y)kmph