To determine which statement is true, we would need specific information or context about the car's journey. However, since no context is provided, we can analyze the statements based on general knowledge:
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The car traveled back to its starting point. - This could be true or false depending on the journey described.
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The total time spent was 45 minutes. - This could also be true or false depending on the context.
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The car never slowed down. - This is typically unlikely unless on a constant decline or in ideal conditions, which is rare in practical scenarios.
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The car’s speed was not constant. - Many car journeys involve varying speeds due to factors like traffic, speed limits, or acceleration and deceleration, so this statement could likely be true.
Without specific details about the car's journey, it's difficult to ascertain which statement is definitely true. However, statement 4 ("The car’s speed was not constant.") is likely the most generally applicable as cars often do not maintain a constant speed.