![]() When two bodies are moving in same direction with speeds s1and s2respectively, their relative speed is the difference of their speeds.If first part of the distance is covered at the rate of v1 in time t1 and the second part of the distance is covered at the rate of v2 in time t2 then the average speed is.Change in time=x t1 for n>m =x t1 for m>n.If a body travels a distance ‘d’ from A to B with speed ‘a’ in time t1 and travels back from B to A i.e., the same distance with m/nof the usual speed ‘a’ then the change in time taken to cover the same distance is given by:.Also, if t1and t2is taken to travel from A to B and B to A respectively, the distance ‘d’ fromA to B.If a certain distance(d), say from A to B, is covered at ‘a’ km/hr and the same distance is covered again say from B to A in ‘b’ km/hr, then the average speed during the wholejouney is given by: Average speed= km/h…(which is the harmonic means of a and b.While travelling a certain distance d, if a man changes his speed in the ration m:n, then the ratio of time taken becomes n:m.Average speed= (Total distance)/(Total time).It is also measured in kilometres per hour (kmph) or miles per hour (mph). SI unit of speed is metre per second (mps). GMD SPEED TIME DOWNLOAD DOWNLOADDownload Quantitative Aptitude Study Material. GMD SPEED TIME DOWNLOAD PDF
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