Ok, my average speed driving to my cabin is 55 miles per hour. Doing so, it takes me four hours to get there. My boyfriend Eric says that I could save at least half an hour if I drove 65 miles per hour. Is that correct? How long will it take me to get there going 65 miles per hour and how much time will I really save. Thanks so much.
2007-12-01 02:33:41 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
[04]
You take 4 hours @55 mph
Therefore,the distance =55*4=220 miles
If the speed is increased to 65 mph,the required time would be
220/65
=3.3846 hrs
=3 hrs 23 minutes(appeoax)
So you will save about 37 minutes which is more than half an hour and your boyfriend is right
2007-12-01 02:41:06 · answer #1 · answered by alpha 7 · 1⤊ 1⤋
Slappy63 is right - it'll take much longer if you get pulled over for going 65 in a 55 ;)
2007-12-01 02:56:14 · answer #2 · answered by Anne 3 · 1⤊ 1⤋
d = 55 x 4 miles
d = 220 miles
t = 220 / 65 h
t = 3.3846 h
t = 3h 23 min
Time saved = 37 min
2007-12-01 03:17:45 · answer #3 · answered by Como 7 · 3⤊ 1⤋
Theoretically your boyfriend is right. (See answer #1).
But you have to take into consideration other factors. Such as other traffic on the road will be traveling the speed limit and you will have to wait to pass them, etc.
2007-12-01 02:43:30 · answer #4 · answered by slappy6363 3 · 1⤊ 1⤋
That is such BASIC MATH and can be done MENTALLY... you don't even need to write it down... so I am not going to waste my time answering it... if you can't do a simple problem like that, then you need to find a different class to take.
2007-12-01 02:42:14 · answer #5 · answered by Anonymous · 1⤊ 3⤋