A person covers 1/3 of a distance at 20 km/h, 1/3 at 30 km/h and the last 1/3 at 60 km/h. Find the average speed.
A. 30 km/h
B. 35 km/h
C. 28 km/h
D. 32 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
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 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.
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