A car covers a distance of 200 km at a uniform speed. If the speed is increased by 10 km/h, the journey takes 4 hours. Find the initial speed of the car. MCQ with Answer and Explanation
A car covers a distance of 200 km at a uniform speed. If the speed is increased by 10 km/h, the journey takes 4 hours. Find the initial speed of the car.
A. 50 km/h
B. 45 km/h
C. 40 km/h
D. 35 km/h
Answer: Option C
Solution (By JKSSB Mock Tests)
New speed = 200 / 4 = 50 km/h. Since the new speed is 10 km/h faster than the original speed, original speed = 50 - 10 = 40 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.
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