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Allisa [31]
3 years ago
14

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 t

han his best time .find his best time.
Mathematics
1 answer:
a_sh-v [17]3 years ago
8 0
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
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