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One person travels on through the sides of an equilateral triangle at a speed of 12 kmph 24 kmph, and 8 kmph, Find the average speed of it. (In kmph)

A14

B13

C12

D11

Answer:

C. 12

Read Explanation:

side of the triangle = x km. Time to cover x km distance at a speed of 12 km/hr = x/12 hrs Time to cover x km distance at a speed of 24 km/hr = x/24 hrs Time to cover x km distance at a speed of 8 km/hr = x/8 hrs Total distance covered by the man = (x + x + x) = 3x Total time to cover the distance = (x/12 + x/24 + x/8) Average speed = 3x/(x/12 + x/24 + x/8) = 3x / (6x/24) = 1/2 × 24 = 12 kmph

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