Moving with a speed 9km/h, Alvis passed the planned distance for 4 h 30 min. For what time it is distance Rayvis will pass, moving with a speed of 13.5?

Rayvis's speed more than the speed of Alvis is 13.5/9=1.5 times. Means, and time of passing of distance will be 1.5 times less and will be 4.5/1.5=3 hours. Answer: 3 hours.
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