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. 52 km/h
B. 54 km/h
C. 50 km/h
D. 48 km/h
Answer: Option C
Solution (By JKExamLibrary)
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.
A delivery car handles a total route profile of 360 km. It clears the first half stretch at 45 km/h and the second half at 90 km/h. Find the net average speed.
If a delivery agent cycles at 15 km/h instead of 11 km/h, he travels 20 km more in the same allotted duration. Find the actual distance covered by him at his lower speed.
Explanation:
Let the time duration be t hours. Distance difference = 15t - 11t = 4t = 20 km => t = 5 hours. Distance covered at lower speed = 11 * 5 = 55 km.
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