Can anyone solve the following problem? If so can you tell me how you got the anwer?
Isaac and his friend are going to climb the hill behind the school on Saturday. They said there are some old railway buildings at the top. It took them 38 minutes to climb the hill. The trail up the hill is 0.4 km. At that rate, how long would it take them to climb one and six tenths kilometers?
2007-09-03 11:21:05 · 10 answers · asked by elie101_forever 3 in Science & Mathematics ➔ Mathematics
38/.4 = x/1.6
[38(1.6)]/.4=x
x=152 minutes=2 hours and 32 minutes
the distance is 4 times longer, so the time is 4 times longer too
2007-09-03 11:29:41 · answer #1 · answered by kelsey 7 · 0⤊ 0⤋
They climb 0.4 km in 38 minutes.
so they will take 4 times 38 mins to climb 1.6km as 1.6 / 0.4 = 4.
therefore they will take 4x 38 minutes i.e. 152 minutes or 2 hours 32 minutes to climb the 1.6 km.
2007-09-03 11:28:08 · answer #2 · answered by Steve T 5 · 1⤊ 0⤋
ok 0.4 km takes 38 min
so in order to get 1.6 km u have to multiply 0.4 x 4= 1.6
So now you multiply the 4 x 38 min=
152 minutes or 2 hours 32 min.
2007-09-03 11:30:26 · answer #3 · answered by misslehawk 2 · 1⤊ 0⤋
ok that's easy
it took them 38 mins to climb 0.4 km
it took them x minutes to climb 1 6/10 km (16/10)=1.6 km
now 0.4*x=38*1.6
so (38*6.1)/0.4 = 60.8/0.4 = 152 mins and that is in hours 152/60 = 2.53 hrs
2007-09-03 11:31:59 · answer #4 · answered by cool j 2 · 0⤊ 0⤋
Proportion
38/.4 = t/1.6
60.8 = .4t {cross multiply}
152 = t
You could have noticed that the new distance 1.6 is 4 times the old distance and merely multiplied the old time by 4
2007-09-03 11:29:59 · answer #5 · answered by kindricko 7 · 1⤊ 0⤋
.4/38 = 1.6/x
x = 38*1.6/.4 = 152 minutes = 2hours 32minutes
2007-09-03 11:36:19 · answer #6 · answered by ironduke8159 7 · 0⤊ 0⤋
divide min by kilometers
38 min / .4 km =95 min per km
Take min per km and multiply by 1.6 km
95 x 1.6 = 152 min
152 min/(60 min per hr)= 2.5
2007-09-03 11:34:35 · answer #7 · answered by David C 2 · 0⤊ 0⤋
.6km/.4km times 38 minutes..6/.4*38=57 minutes
2007-09-03 11:28:01 · answer #8 · answered by jimmymae2000 7 · 0⤊ 2⤋
Took 38min to do 0.4km, How long to travel 1.6km. Set it up as a ratio.
38min / 0.4km = x min / 1.6 km
Multiply both sides by 1.6km to isolate "x"
1.6km * (38min / 0.4km) = x min
152 min = x
2007-09-03 11:26:38 · answer #9 · answered by ryuku32 3 · 1⤊ 1⤋
1hour and 40 min
2007-09-03 11:25:14 · answer #10 · answered by Anonymous · 0⤊ 4⤋