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 best time.

Question

anonymous · Answer

let best time be x and second best time be 7  
according to the first condition  x - y = 4 
according to the second condition  y = 3/4 x    
now you need to solve the equations.

anonymous · Answer

*the second best time be y (not 7)

anonymous · Answer

hmm, isn't y>x

anonymous · Answer

yes you are right ...   
second best time is x and best time is y  
so x-y = 4 
x = 3/4 y

anonymous · Answer

think its x = 4/3 y