1.

drive from A to BA Motorcyclistwithuniforms speed of 30 km/hows and return backwith a speed of 20 km/hod. find the average

Answer»

Since distance is constant we have to use harmonic mean to calculate the average speed of the motorcycle2ab/(a+b)a=speed from A to B=30km/hb=speed from B to A=20km/h2*30*20/(30+20)2*600/502*1224km/hThe average speed of the motorcycle is 24km/h



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