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A car covers the first 40% of a distance at a speed of 24 km/h and the remaining distance at a speed of 72 km/h. If the total distance is 480 km, then what is the average speed of the car for the entire journey?

1. 50 kmph
2. 40 kmph
3. 60 kmph
4. 30 kmph

Correct answer: 40 kmph

Solution

The first 40% of 480 km is 192 km, covered at 24 km/h, taking 8 hours. The remaining 288 km is covered at 72 km/h, taking 4 hours. Total time is 12 hours, so average speed = 480/12 = 40 km/h.

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