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Question 69
Smith travels along four sides of a square at speeds of 10, 12, 15 and 20 km/hr. The average speed of the Smith is:
Solution
Average Speed=Total distance/Total time
Let the side of the square be 's' and so total distance=4s
Total time =(s/10)+(s/12)+(s/15)+(s/20)
=18s/60
Average speed=4s/(18s/60)
=40/3 km/hr
=$$13\frac{1}{3}$$ km/hr
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