Mathematics · Time, Speed and Distance
A train engine can run at 18 km/h without any wagons attached. The reduction in its speed is directly proportional to the square root of the number of wagons attached. If its speed with 9 wagons is 12 km/h, what is the maximum number of wagons the engine can just move?
- 1100
- 2101
- 381
- 480✓
Correct answer
80
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