A car is running first 5 kilometers at a speed of 40 km/hr , next 20 kilometers at 60 km/hr and then another 30 kilometers at 50 km/hr speed. Then the - Quantitative Aptitude MCQ Competitive Exam 2026 | ExamTest.live

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A car is running first 5 kilometers at a speed of 40 km/hr, next 20 kilometers at 60 km/hr and then another 30 kilometers at 50 km/hr speed. Then the average speed of the car is:

Solution & Step-by-step Explanation

The formula for average speed is: Average Speed = \frac{Total Distance}{Total Time} 1. Total Distance: D = 5 + 20 + 30 = 55 km 2. Total Time taken: t_{1} = \frac{5}{40} = \frac{1}{8} hr t_{2} = \frac{20}{60} = \frac{1}{3} hr t_{3} = \frac{30}{50} = \frac{3}{5} hr Total Time (T) = \frac{1}{8} + \frac{1}{3} + \frac{3}{5} The LCM of 8, 3, 5 is 120 . T = \frac{15 + 40 + 72}{120} = \frac{127}{120} hr 3. Average Speed Calculation: Average Speed = \frac{55}{\frac{127}{120}} = \frac{55 \times 120}{127} = \frac{6600}{127} \approx 51.9685 km/hr Rounding up gives 51.97 km/hr .

Try it yourself before checking the explanation above.

A car is running first 5 kilometers at a speed of 40 km/hr, next 20 kilometers at 60 km/hr and then another 30 kilometers at 50 km/hr speed. Then the average speed of the car is:

51.97 km/hr

50 km/hr

52.3 km/hr

50.6 km/hr

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