Question 365086
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Hi, 
Let x represent the speed the plane usually flies
d = r*t
4400km = x*t
t = 4400/x
4400km = (x + .10x)(t -.5hr)
4400km = 1.10x(4400/x -.5hr)
4400km =4840-.55hr*x 
.55x = 440
x = 800km/hr