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Christopher's best time in a race is four seconds faster than his second-best time. His second-best time is 1 1/3 times slower than his best time. Find his second-best time.angel

Guest Feb 21, 2017
 #1
avatar+87293 
+5

Second Best = Best + 4 sec    (1)

 

(4/3)Best  =  Second Best  (2)

 

Sub (1) into (2)

 

(4/3)Best  =  Best + 4

 

(1/3)Best  = 4

 

Best  = 12  seconds

 

Second Best  = (4/3)Best  =  (4/3)12  =  48/3   = 16 seconds

 

 

 

cool cool cool

CPhill  Feb 21, 2017

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