8. if it took lex from 10:00 a.m. to 11:45 a.m. to walk 14 blocks, what was his average speed in blocks per hour?
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{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "blank_filling_formatter", "explain_then_answer", "tutor", "mastery_adaptive_brevity" ], "needs_drawing": false, "concepts_used": [ "Unit Conversion" ], "new_concepts": [ "Average Speed Calculation" ], "current_concepts": [ "Unit Conversion", "Average Speed Calculation" ] } ## Calculate the elapsed time in hours Using the *Unit Conversion* knowledge point $$ \begin{aligned} \Delta t &= 11:45\text{ a.m.} - 10:00\text{ a.m.} = 1\text{ hour } 45\text{ minutes}\ \Delta t &= 1 + \frac{45}{60} = 1.75\text{ hours} \end{aligned} $$ ## Calculate the average speed We find the average speed by dividing the total distance by the total time. $$ \begin{aligned} \text{Distance} &= 14\text{ blocks}\ \text{Average Speed} &= \frac{14\text{ blocks}}{1.75\text{ hours}} = 8\text{ blocks per hour} \end{aligned} $$ If it took Lex from 10:00 a.m. to 11:45 a.m. to walk 14 blocks, what was his average speed in blocks per hour? 8 { "subject": "Mathematics", "question_type": "Fill-in-the-blank", "knowledge_point": [ "Mathematics", "Algebra", "Average Speed Calculation" ] }

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Calculate the elapsed time in hours

Calculate the average speed

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