Respuesta :
Answer:
400, 475
Step-by-step explanation:
Speed of planes : x and x+75
4x + 4*(x+75) = 3500
4x + 4x + 300 = 3500
8x = 3200
x = 400
X+75 = 475
Answer: the speed of the first plane is 400 miles per hour.
the speed of the second plane is 475 miles per hour.
Step-by-step explanation:
Let x represent the speed of the first plane.
Their speeds differ by 75mph. This means that the speed of the second plane would be x + 75
Two planes, which are 3500 miles apart, fly toward each other. If they pass each other in 4 hours, It means that both planed traveled a total distance of 3500 miles in 4 hours.
Distance = speed × time
Distance travelled by the first plane after 4 hours would be
4 × x = 4x
Distance travelled by the second plane after 4 hours is
4(x + 75) = 4x + 300
Since the total distance travelled by both planes after 4 hours is 3500 miles, then
4x + 300 + 4x = 3500
8x = 3500 - 300 = 3200
x = 3200/8 = 400 miles per hour
The speed of the second plane would be
400 + 75 = 475 miles per hour.
