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December 20, 2014

December 20, 2014

Posted by **Paige** on Wednesday, March 2, 2011 at 5:31pm.

Please check

if a greyhound bus travels 7mph slower than the express bus. the express bus travels 45 miles in the time it takes the greyhound bus to travel 38 miles. find the speed of each bus

greyhound 38/x-7 express 45/x

38/x-7=45/x

38x=45x-315

-7x=-315

x=45

45-7=

38mph for greyhound

45mph for express

- Algebra 2 word problem -
**Helper**, Wednesday, March 2, 2011 at 5:47pmCorrect :)

- Algebra 2 word problem -
**MathMate**, Wednesday, March 2, 2011 at 5:47pmThe answer is correct!

However, please be careful with parenthese:

38/x-7 ≡ (38/x) - 7

because multiplications and divisions take precedence over additions and subtractions.

If you want 38/(x-7), you*need*the parentheses.

A general rule is to insert parentheses around the numerator and denominator.

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