A train travels at a constant speed along a straight track. The equation x = 45r gives the distance x, in meters, that the train travels r seconds after passing a signal post. How many meters will the train have traveled 4 seconds after passing the signal post?

The given equation x = 45r is a linear relationship for constant speed, where x is distance and r is time. Substituting 4 for r gives x = 45 multiplied by 4. The result is 180 meters.

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