Rate of Change Word Problem SAT Math Practice

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A nice multiple step problem on rate of change. This is a good word problem to practice for the SAT Math Test.
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I just subtracted 90 from 210 which is 120 and I divided it by 3 cuz there were three 30 minutes in that time which gives 40 feet per 30 minutes. and then i went up as the hours increased by 30 which gave me 2:00pm

buchucraft
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From 9:30 AM to 11:00 AM, it's constantly + 120 feet. To get to 450, the climber needs 240 feet from 210 to 450 so 3 hours from 11:00 should make it 2:00 pm.

Edit: ah I didn't know there was a formula. That saves... time haha

Sgth
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Could you do a video on proving the product of roots (c/a) and the sum of roots (-b/a) for quadratic equations?

santtusavola