A person travels one-fourth of the total distance at 10 km/h, one-fourth at 20 km/h, one-fourth at 30 km/h and the remaining one-fourth at 40 km/h. Find the average speed for the whole journey.

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Answer & Explanation

Correct AnswerB. 19.2

Quick Explanation

For equal distances, average speed = 4/(1/10 + 1/20 + 1/30 + 1/40) = 19.2 km/h.

Average speed for equal distances = n / sum(1/speed)

For equal distances, average speed = 4/(1/10 + 1/20 + 1/30 + 1/40) = 19.2 km/h.

Use the standard formula directly after identifying the quantities.

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