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October 20, 2014

October 20, 2014

Posted by **Jon** on Saturday, February 16, 2008 at 11:40am.

A)no more than 100 mph

C)at least 100 mph

I think it's A b/c 83+85+92+95+100/5 = 91 mph. it cant be C b/c it says "at least" 100 which means it can go faster than 100 so the answer is A.

- Algebra -
**bobpursley**, Saturday, February 16, 2008 at 12:04pm5*91>(84+85+92+95+S)

455>356+S

99>S

So the answer is in the above: Superman cannot be going 99 or faster.

check my thinking.

- Algebra -
**Jon**, Saturday, February 16, 2008 at 12:21pmif 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

- Algebra -
**Jon**, Saturday, February 16, 2008 at 12:23pmif it's at 100, the average would be 91 exactly

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