SOLUTION: The class ran m feet at z feet per minute and arrived at lunch 3 minutes late. How fast should they have run to have arrived on time? ---Any help is greatly appreciated :)

Question 1015053: The class ran m feet at z feet per minute and arrived at lunch 3 minutes late. How fast should they have run to have arrived on time? ---Any help is greatly appreciated :)
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The class ran m feet at z feet per minute and arrived at lunch 3 minutes late. How fast should they have run to have arrived on time?
:
let s = speed required to arrive on time
write a time equation; time = dist/speed
:
slow time - normal time = 3 min
- = 3
multiply equation by sz, cancel the denominators
ms - mz = 3sz
solve for s
ms - 3sz = mz
Factor out s
s(m - 3z) = mz
s = ; the running speed to arrive on time

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