from my 11:40 post

if the average speed of ALL 5 coasters is no more than 91 mph then that last coaster has to be 100 mph to reach a speed of 91 on average. if superman goes at 99 then the average would be only 90.8 if it's at 100, the average would be 91 exactly

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  1. 83+85+92+95+s=5(91)
    s = 455-355
    s = 100
    I agree

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