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.

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Mathematics

Gillespie

23 January, 17:19

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.

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Annika Ritter · Answer 1

If his best time is x, and the best time is smaller, then (1+1/3) * x=his second best time. If x+4=his second best time (since his second best time is 4 seconds slower), then (1+1/3) * x=x+4. Multiplying it out, we get (3/3+1/3) * x=x+4

=4x/3=x+4. Subtracting x from both sides, we get 4x/3-3x/3=x/3=4. Multiplying both sides by 3, we get x=12=his best time