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Pierrecompetes ina triathlonalonga courseas showninthe figurebelow, Hebeginsswimmingat startingpointS andswimsstraightacrossthe lake, getsonhisbicycleat stationA,bikesto stationB,and themrunsto finishinglineF.The judgesusea stopwatch torecordhis elapsedtimesoft_A,t_B andt_F hoursfrompointS to points A,B , andF, respectively.If thedistance, in miles, betweenpoints Sand Aalongthe racecourseis denotedby SA, thenwhatispierre 'saveragespeedfor thisrace, inmilesper hour? |
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Answer» `(SA )/(T_A)` |
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