1.

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?

Answer»

`(SA )/(T_A)`
`(SB)/(T_B)`
`(SF)/(T_F)`
`(SA)/(T_F)`

ANSWER :B


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