The driver of a car travelling at a speed of 60 km/h decides to slow down to 40 km/h after covering half of the distance. What is the average speed of - Quantitative Aptitude MCQ Competitive Exam 2026 | ExamTest.live

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The driver of a car travelling at a speed of 60 km/h decides to slow down to 40 km/h after covering half of the distance. What is the average speed of the car (in km/h)?

Solution & Step-by-step Explanation

When equal distances are covered at two different speeds v_{1} and v_{2}, the average speed is given by the harmonic mean formula: Average Speed = \frac{2 v _{1} v _{2}}{v _{1} + v _{2}} Given: v_{1} = 60 km/h v_{2} = 40 km/h Substitute the values: Average Speed = \frac{2 \times 60 \times 40}{60 + 40} Average Speed = \frac{4800}{100} = 48 km/h

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The driver of a car travelling at a speed of 60 km/h decides to slow down to 40 km/h after covering half of the distance. What is the average speed of the car (in km/h)?

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