While runnin the marathon, Emily averages 10 min a mile for the first b hours where b <4.3. in terms of b, how much farther does emily have to run in order to complete the 26 mile race
a) 26 - 6b b) 26-600b c)6b-26 d) 26 - (6/b) e) 26 - (b/6)
2007-07-16 02:54:57 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
If it takes her 10 minutes to run a mile, she running 6 miles per hour.
So if she's been running at 6 miles per hour for b hours, she has run 6b miles, since rate x time = distance.
So she has 26 - 6b miles to go (a)
2007-07-16 03:01:48 · answer #1 · answered by Anonymous · 1⤊ 0⤋
10 min/mile = 6 mph
6b + x = 26
x = 26 - 6b (a is your answer)
2007-07-16 10:05:25 · answer #2 · answered by gebobs 6 · 0⤊ 0⤋
The answer is (a).
Realizing that 10 minutes per mile is the same as 6 miles per hour is the key that makes this problem easier. The expression subtracts the distance she already ran (expressed as rate X time b) from the total.
2007-07-16 10:07:10 · answer #3 · answered by donxfive 2 · 0⤊ 0⤋