SOLUTION: A man travels 100km at a speed of x km/hr. He finds that he could have saved 2.5hrs if he had increased his speed by 2km/hr. Find x. I made the equation: 100/x - 2.5 = 100/x+2

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Question 1041921: A man travels 100km at a speed of x km/hr. He finds that he could have saved 2.5hrs if he had increased his speed by 2km/hr. Find x.
I made the equation: 100/x - 2.5 = 100/x+2
Is this right? Thanks :)

Found 2 solutions by Edwin McCravy, Alan3354:
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
Your equation would be correct if you would place 
parentheses correctly. This is your reasoning,
using 

  


Not this:

100/x - 2.5 = 100/x+2

But this:

100/x - 2.5 = 100/(x+2)

When typing algebra all on 1 line, if a
numerator or a denominator contains more
than just 1 number, or just 1 letter, you
must type a left parenthesis "(" to indicate
where the numerator or denominator starts,
and a right parenthesis ")" to indicate where
it ends.

Edwin

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
A man travels 100km at a speed of x km/hr. He finds that he could have saved 2.5hrs if he had increased his speed by 2km/hr. Find x.
I made the equation: 100/x - 2.5 = 100/x+2
Is this right? Thanks :)
---
Solve for x and see.
It's not clear. Add parentheses.
================
d = r*t
100 = x*t
100 = (x+2)*(t - 2.5)
------
Can you do the rest?

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