The answer is: [B]: 0.40 km/min .
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Explanation:
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From the graph attached, which is "linear", we have 75 minutes (x-axis);
corresponding to 30 km (y-axis);
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We notice that all the answer choices are given in units of:
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→ "km/min" ; that is, "kilometers per minute" ;
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→ So, 30 km / 75 min = (30/75) km/ min = ? km / min ;
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→ (30/75) = (30÷15) / (75÷15) = ⅖ km/min ; or 0.4 km/min ;
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→ or; use calculator: (30/75) = (30÷75) = 0.4 km/min ;
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→ which corresponds to:
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→ Answer choice: [B]: 0.40 km/min .
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