Posted by Ronaldo on Tuesday, January 25, 2011 at 9:43pm.
Boston is 200 mi away from NY. It takes me 1 hour less to drive to Boston when I drive 10 mi faster than my normal rate. What is my normal rate?

Math  helper, Tuesday, January 25, 2011 at 10:04pm
D = RT (Distance = Rate x Time)
Normal Rate
R = rate
T = time
RT = 200
Increased Rate/less time
R + 10
T  1
(R + 10)(T  1) = 200
Solve these two equation simultaneously.
(R + 10)(T  1) = 200
RT = 200
Expand the first equation and substitute RT = 200, for RT in that expansion.
Then solve for R and T (quadratic equation).
Answer This Question
Related Questions
 Math  Boston is 200 mi away from NY. It takes me 1 hour less to drive to Boston...
 Trig  Boston is 200 mi away from NY. It takes me 1 hour less to drive to Boston...
 math question  Problem A businessman drives from Washington, D.C. to Boston, a ...
 math word problem  Here's the latest from the UMW math department: Andy drove ...
 Math  Please review. Ella can drive 65 mi on side roads in the same time that ...
 distance  At 9AM, a freight train leaves Boston for NYC, traveling at an ...
 Math  Gabby travels from Baltimore to Boston each year. It takes him 10 hours ...
 Algebra  I don't have a close about this question !!!!!!!! It takes you 3 hours...
 algebra  During rush hour, Bill can drive 60 miles using the side roads in the ...
 Calculas HS  the Museum of Science in Boston displays a running total of the U....
More Related Questions