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A tourist covers half of his journey by train at 60 km/h, half of the remainder by bus at 30 km/h and the rest by cycle at 10 km/h. The average speed of the tourist in km/h during his entire journey is
- 36
- 30
- 24
- 18
Correct answer: 24
Solution
For distance D: D/2 at 60, D/4 at 30, D/4 at 10. Time = D/120 + D/120 + 3D/120 = 5D/120 = D/24, so average speed = D/(D/24) = 24 km/h. The answer is 24 (option C), not the stored 18.
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