RPF 10 Jan 2019 Slot 1 Question 106

Question 106

A Person travel Equilateral triangular area with the speed of 12kmph, 24kmph and 8kmph along the planes of the triangular field. Find the average speed of the entire journey. (in Kmph)

Solution

Since, the distance travelled is equal on the three sides, hence average speed will be the harmonic mean of the speeds.

= $$\frac{3}{\frac{1}{12}+\frac{1}{24}+\frac{1}{8}}$$

= $$\frac{3}{\frac{2+1+3}{24}}$$

= $$\frac{3}{6}\times24=12$$ km/hr

=> Ans - (C)



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