Saturday

August 2, 2014

August 2, 2014

Posted by **Taylor** on Monday, January 24, 2011 at 3:12pm.

- math -
**Reiny**, Monday, January 24, 2011 at 3:34pmher original speed be v

then vx = 100

her faster speed = v+5

(x-3)(v+5) = 100

xv + 5x - 3v - 15 = 100

100 + 5x - 3v = 115

5x - 3v = 15

v = (5x-15)/3

sub into 1st

x((5x-15)/3) = 100

5x^2 -15x = 300

x^2 - 3x - 60 = 0

I get x = 9.39 by using the formula (and v = 10.65)

check: (9.39)(10.65) = 100.0035

(6.39)(15.65) = 100.0035

YEAHH!

**Related Questions**

Math - Traveling at r kilometers per hour for t hours, a driver will travel rt ...

ALGEBRA - If traveling at r kilometers per hour for t hours, a driver will ...

Math - A woman rides her bicycle from her house to and from a lake. It takes her...

Math - A motorist makes a journey of 240 km from Singapore to Malacca to visit ...

math - Traveling at r kilometers for t housrs, a driver will travel rt kilometer...

calculus - At noon, you and I start at the same place, and then you head east at...

MATH - Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per ...

math - Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per ...

math - Samantha’s speedometer reads in kilometers per hour. If the legal speed ...

math - Edna and Nancy leave the house of a common friend at the same time and ...