A car travels 25 km at a speed of 25 km/h, next 25 km at a speed of 50 km/h and the next 25 km at a…
The average speed is approximately 41 km/h. Total distance is 75 km and total time is 25/25 + 25/50 + 25/75 = 11/6 hours, giving 75 ÷ (11/6) = 450/11 ≈ 40.91 km/h.
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A car travels 25 km at a speed of 25 km/h, next 25 km at a speed of 50 km/h and the next 25 km at a speed of 75 km/h. What is the approximate average speed of the car ?
Answer and explanation
Correct answer D
The average speed is approximately 41 km/h. Total distance is 75 km and total time is 25/25 + 25/50 + 25/75 = 11/6 hours, giving 75 ÷ (11/6) = 450/11 ≈ 40.91 km/h.
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