jpwalker9017
15.10.2019 •
Mathematics
Two airplanes leave the airport at the same time, flying in opposite directions. one plane flies 150 miles per hour faster than the other. after 4 hours, they are 2,200 miles apart. what rate are they each flying? 150 mph and 300 mph 200 mph and 350 mph 250 mph and 400 mph 225 mph and 375 mph
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Ответ:
option B
200 mph and 350 mph
Step-by-step explanation:
Suppose speed of one plane = x miles/h
speed of other plane = (150 + x) miles/h
distance between two plane after 4 hours = 2200 miles
To solve this question we will add up both plane's distance covered in 4 hours and equal them to 2200 miles
Formula to use
distance1 = speed x time
= x(4)
distance2 = speed x time
= (150+x)(4)
Total distance covered
2200 = distance1 + distance2
2200 = 4x + (150+x)4
2200 = 4x + 600 + 4x
2200 = 8x + 600
8x = 1600
x = 1600/8
x = 200 miles/h
x + 150 = 200 + 150 = 350miles/hour
Ответ:
a
step-by-step explanation: