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

The five fastest roller coasters in the world Fujiyama(Japan), Goliath(CA), Millenium Force(OH), Steel Dragon 2000(Japan), and Superman the Escape(CA). The speeds, in mph, of the first four coasters are 83,85,92,and 95, respectively. How fast can Superman the Escape travel if the average speed of all five coasters is no more than 91 mph?

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 12:04pm
5*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 12:21pm
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

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

## Answer this Question

## Related Questions

- Physics - This speed is the maximum possible speed attained by the roller ...
- Physics - This speed is the maximum possible speed attained by the roller ...
- Physics - This speed is the maximum possible speed attained by the roller ...
- Physics - Analyzing Roller Coaster Performance Using Conservation of Mechanical ...
- Math - One of the world's fastest roller coasters is located in a theme park in ...
- Math - 17.Which roller coaster has the greatest lift height Top Thrill Dragster ...
- algebra - Superman the Escape in CAlifornia is the fastest roller coaster in the...
- algebra - Do you like roller coasters? If you were asked to design a roller ...
- Math - Sophia went to an amusement park. She went on 18 rids in all. 7 of the ...
- Physics - we are doing a really dumb websearch in my Physics class on roller ...