Question

What is the unit rate, expressed in kilometers per minute?

Answer 1

The correct answer is D

Answer 2

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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