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Melanie observes a marble travel along a horizontal path at a constant rate. The marble travels 1/30 of the length of the path in 2 1/4 seconds. At that rate, how many seconds does it take the object to travel the full length?

Sagot :

Keijosalonenidn

Answer: time is 67,5 s

Explanation: 21/4 seconds is 2.25 second and marble rolls 1/30 part of the path.

The marble needs whole path 30·2.25 seconds, also 67.5 s

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