A luxury car handles a tracking route sector of 180 km. It finishes the first half segment stretch at 45 km/h and the second half sector at 60 km/h. Find the mean average speed recorded across the full route. MCQ with Answer and Explanation
A luxury car handles a tracking route sector of 180 km. It finishes the first half segment stretch at 45 km/h and the second half sector at 60 km/h. Find the mean average speed recorded across the full route.
A. 51.42 km/h
B. 48.2 km/h
C. 55.00 km/h
D. 53.50 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
Average Speed across sectors = 2xy / (x + y) = (2 * 45 * 60) / (45 + 60) = 5400 / 105 = 51.42 km/h.
Explanation:
Let each third of the distance be 60 km. Total distance = 180 km. Total time taken = 60/20 + 60/30 + 60/60 = 3 + 2 + 1 = 6 hours. Average speed = 180 / 6 = 30 km/h.
A runner tracks a circular field loop course of radius 70 meters. If his speed registers at 20 m/s, find the total loop rounds completed by him in 2 minutes 12 seconds.
A locomotive express train passes a milestone column track point in 15 seconds flat. If the speed index of the train records at 72 km/h, find the length of the train layout.
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