Answer:
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
