John left at 1:53 to visit his gradma's house. He arrived at 6:09 after driving fifty-four mph. On the way home, John drove sixty-one moh. How long will it take John to drive home??
2007-05-28 15:07:07 · 10 answers · asked by skatergirl472 3 in Science & Mathematics ➔ Mathematics
so he drove 4hr 16 mins at 54mph, so it is
54*4.267=230.40 miles
so 230.40/61=3.77 hours or 3 hr. 46 mins
2007-05-28 15:11:08 · answer #1 · answered by leo 6 · 0⤊ 0⤋
You use one equation twice to solve this:
distance = rate * time
On the way out, you are told the rate, and can figure out that John took 4 hours and 16 minutes (the time between 1:53 and 6:09):
distance = rate * time
distance = 54 mph * (4 + 16/60 hours)
distance = 230.4 miles
On the way back, now that we know the distance (and are given the rate), we can solve for time:
distance = rate * time
230.4 miles = 61 mph * time
time = 230.4 miles / 61 mph
time = 3.777 hours
time = 3 hours, (0.777 * 60) minutes
time = 3 hours, 46.62 minutes
(I'd round that up to 3 hours, 47 minutes.)
2007-05-28 22:10:59 · answer #2 · answered by McFate 7 · 2⤊ 0⤋
Find how long he took to drive to grandma's house.
6:09 - 1:53 = 4:16 = 4 4/15 = 64/15 hours
54 * 64/15 = 230.4 miles
230.4 / 61 = 3.777 hrs
2007-05-28 22:19:51 · answer #3 · answered by johnnizanni 3 · 0⤊ 0⤋
So on the first trip, he drove 54 mph in 4 hours and 16 mins.
4 hours and 16 mins = 256 mins
256 mins * 54/60 miles per minute = 230.4 miles
So he travels a total distance of 230.4 miles.
On the way back, he's going to travel 230.4 miles at 61 mph
= 230.4/61 hours
= 3 hours 46.6 mins
2007-05-28 22:14:16 · answer #4 · answered by shanhelp 3 · 0⤊ 0⤋
3 hours and 49 minutes.
6:09
-1:53
=4:56
61-54=7
3:49
sorry if this is confusing, I solve things my own way
2007-05-28 22:10:38 · answer #5 · answered by sandn 3 · 0⤊ 0⤋
3 hours and 53 minutes
2007-05-28 22:12:07 · answer #6 · answered by Derrick D 3 · 0⤊ 1⤋
What if John sees a duck in the road, and speeds off the road into a ravine? Then john never gets home... I'm sorry, I have a vendetta against every character ever to grace the pages of a math book. I hate math...
2007-05-28 22:14:17 · answer #7 · answered by ? 2 · 0⤊ 2⤋
about 3 hours and 45 minutes
2007-05-28 22:12:18 · answer #8 · answered by Bella McBee 1 · 0⤊ 0⤋
I think it took 3hours and 45 minutes
2007-05-28 22:26:39 · answer #9 · answered by zashley4eva 1 · 0⤊ 0⤋
less than it did to get there
2007-05-28 22:10:27 · answer #10 · answered by cabhappygaz 2 · 0⤊ 2⤋