A fast cargo van handles 360 km at 45 km/h and another 240 km at 60 km/h. Find the overall average speed.
A. 48 km/h
B. 54 km/h
C. 52 km/h
D. 50 km/h
Answer: Option D
Solution (By JKSSB Mock Tests)
Total distance = 360 + 240 = 600 km. Time for first part = 360 / 45 = 8 hours. Time for second part = 240 / 60 = 4 hours. Total time = 8 + 4 = 12 hours. Average speed = 600 / 12 = 50 km/h.
Excluding institutional stops, the speed of an intercity coach is 72 km/h and including stops it is 60 km/h. For how many minutes does the coach stop per hour?
Explanation:
Distance 1 = 50 * 3 = 150 km. Distance 2 = 60 * 2 = 120 km. Total distance = 270 km. Total time = 5 hours. Average speed = 270 / 5 = 54 km/h.
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