each side of the length of a square plaza measures 2km. a man walks along the first side at a speed of 15kmph, second side at 6kmph and the third side at 10kmph. if his average speed to cover all the four sides is 10kmph, find the speed at which the covered the fourth side.

• Time taken to cover 4 sides = 2*4/10 = 0.8 hrs = 48 mins
  Time taken to cover three sides = 2/15+2/6+2/10 = 8+20+12 = 40 mins
  Time taken to cover 4ty side = 48-40= 8 mins = 8/60 hrs
  speed at which he covered the fourth side = 2*60/8 = 15 kmph
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