Susan participated in a Walkathon last week to raise money for charity. She finished 1/5 of the 12 mile walk in ¾ of an hour. What is her average rate of speed in miles per hour? Express your answer as a decimal rounded to the nearest hundredth.
9/16 mph
13/5 mph
10/9 mph
16/5 mph
2007-12-24 01:07:38 · 9 answers · asked by sunny p 1 in Science & Mathematics ➔ Mathematics
Average speed
(12/5) / (3/4) mph
(12/5) x (4/3) mph
48/15 mph
16/5 mph
2007-12-24 01:37:27 · answer #1 · answered by Como 7 · 2⤊ 0⤋
1/5 *12= 12/5 divided by 3/4=12/5 *4/3=48/15=16/5 mph =3 1/5 or 3.2 mph
2007-12-24 01:13:44 · answer #2 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
1/5th of 12 mile = 12/5 miles in 45 minutes
12/5 miles 45 minutes
? miles 60 minutes
= 12/5 /45 * 60 = (12 * 60)/(5 * 45) = 720/225 = 3.2 miles per hour or
32/10 =
16/5 mph
~~~
2007-12-24 01:12:05 · answer #3 · answered by A Little Sarcasm Helps 5 · 0⤊ 0⤋
1/5 * 12 = 12/5 miles
(12/5) / (3/4) = (12/5) * (4/3) = (4/5) * (4/1) = 16/5 mph
= 3.20 miles per hour
2007-12-24 01:32:51 · answer #4 · answered by reg 5 · 0⤊ 0⤋
rate = distance/time
rate = (12*1/5)/3/4) = 16/5 mph
2007-12-24 01:16:58 · answer #5 · answered by ironduke8159 7 · 1⤊ 0⤋
you at the instant are not certainly looking the halfway mark for this question. in case you necessary to locate the fraction it fairly is halfway, you will possibly purely upload up the two fractions. this provides 7/6. after which you will possibly divide the precise by ability of two. so which you get 3.5/6 yet you will possibly could desire to multiply the two by ability of two considering the fact which you would be unable to have a decimal interior a fragment. this provides 7/12. whether, you do no longer could desire to do any of this. you purely could desire to put in a selection that makes the assertion authentic. To be a ideal fraction, the denominator must be a minimum of 5. whether, 4/5 is bigger than 2/3, so as which would be unable to be the respond. enable's pass bigger. 4/6 is certainly equivalent to 2/3, so as which would be unable to be the respond. The fraction could desire to be between those 2 numbers. It would be unable to be equivalent to the two of them. enable's attempt back. 4/7 certainly works because of the fact it fairly is larger than a million/2 yet smaller than 2/3. So, your answer is [7]. wish this helped you! solid success to you and God bless! :)
2016-11-24 22:33:15 · answer #6 · answered by ? 4 · 0⤊ 0⤋
Speed = distance / time
The distance she has travelled so far = 1/5 * 12 miles = 2.4 miles
Speed = 2.4 miles / (3/4)hr = 3.2 miles /hr
Rounding up to the nearest hundreth ==== 3.20 miles/hr
2007-12-24 05:17:58 · answer #7 · answered by BrushPicks 5 · 0⤊ 1⤋
d = rt
(1/5)(12) = (3/4)t
t = (12/5)/(3/4) = (12/5)(4/3) = (4/5)(4/1) = 16/5
2007-12-24 01:55:48 · answer #8 · answered by Anonymous · 0⤊ 1⤋
9/16mph I think
2007-12-24 01:11:15 · answer #9 · answered by Princess 2 · 0⤊ 2⤋