Two jets are traveling toward each other an are 3400 km apart. One jet is flying 875 km/h. The other jet is flying at 825 km/h. In how many hours will the jets pass each other?
2007-09-17 08:26:58 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
If one jet is flying at 875 km/h and the other is flying at 825 km/h, that means that after one hour they will be (875 + 825) = 1700 km closer to each other. So to cover a distance of 3400 km, they will need (3400 km / 1700 km/hr) = 2 hours.
2007-09-17 08:31:39 · answer #1 · answered by RustyL71 4 · 2⤊ 0⤋
If one jet is flying at 875 km/h and the other is flying at 825 km/h, that means that after one hour they will be (875 + 825) = 1700 km closer to each other. So to cover a distance of 3400 km, they will need (3400 km / 1700 km/hr) = 2 hours.
Good luck!!!
2007-09-17 15:35:14 · answer #2 · answered by Sandy 4 · 0⤊ 0⤋
the are moving opposite each other, so treat one jet with a negative speed
set one jet at the origin of your coordinate system
s1 = 0
s2 = 3400
v1 = 875
v2 = -825
distance = rate*time
d1 = 875*t
d2 = 3400 - 825*t
set them equal and solve for t
875*t = 3400-825*t
t = 3400/(875+825) = 2 hrs.
2007-09-17 15:34:44 · answer #3 · answered by civil_av8r 7 · 0⤊ 0⤋
???
distance/rate = time.
The two jets are approaching at a rate of 1700 km/h and that means 3400 km will take 2 hours.
Doug
2007-09-17 15:33:21 · answer #4 · answered by doug_donaghue 7 · 0⤊ 0⤋
You know how far they have to travel and you know how fast they are going. rate * time = distance
So if t = hours then
825km/h * t + 875km/h * t = 3400
Solve for t
2007-09-17 15:33:14 · answer #5 · answered by gitter1226 5 · 0⤊ 0⤋