A transport van tracks from terminal X to Y at 40 km/h and handles the return trip route back to X at 60 km/h. What is the average speed recorded across the full round journey? MCQ with Answer and Explanation
A transport van tracks from terminal X to Y at 40 km/h and handles the return trip route back to X at 60 km/h. What is the average speed recorded across the full round journey?
A. 52 km/h
B. 48 km/h
C. 50 km/h
D. 46 km/h
Answer: Option B
Solution (By JKSSB Mock Tests)
Average Speed across course = 2xy / (x + y) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.
A thief is spotted by a policeman from a distance of 150 meters. The thief runs at 11 km/h and the policeman chases him at 12 km/h. Find the distance covered by the thief before he is caught.
Explanation:
Relative speed = 12 - 11 = 1 km/h. Time to catch the thief = 0.15 km / 1 km/h = 0.15 hours. Distance covered by thief = Speed * Time = 11 km/h * 0.15 hours = 1.65 km = 1650 meters.
Explanation:
Total distance = 30 + 40 = 70 km. Time for first part = 30 / 10 = 3 hours. Time for second part = 40 / 20 = 2 hours. Total time = 5 hours. Average speed = 70 / 5 = 14 km/h.
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