Athletic race

In a race, the second-place finisher crossed the finish line 1 1/3 minutes after the first-place finisher. The third-place finisher was 1 3/4 minutes behind the second-place finisher. The third-place finisher took 34 2/3 minutes.
How long did the first-place finisher take?

Correct answer:

a =  31.5833 min

Step-by-step explanation:

c=3423=34+23=34 3+23=104334.6667 min t2=134=1+34=1 4+34=74=1.75 min  b=ct2=34.66671.75=3951232.9167 min t1=113=1+13=1 3+13=431.3333 min  a=bt1=32.91671.3333=37912 min=31712 min=31.5833 min



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