GATE 2013 CS (CS1) – Question 9

General Aptitude · Quantitative Aptitude: Data Interpretation, Arithmetic and Number Computation · 2 marks · Multiple choice

A tourist travels half the journey by train at 60 km/h, half the remainder by bus at 30 km/h, and the rest by cycle at 10 km/h. Find average speed in km/h.

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Correct answer: (C) 24

Explanation

For total distance D, the times are D/120, D/120 and D/40, corresponding to distances D/2,D/4,D/4. Total time is D(1/120+1/120+1/40)=D/24 hours. Thus average speed is 24 km/h, C; averaging the three speeds directly is inappropriate.

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