they are d miles apart at the start
Va + Vb = V
V(1) = d
V(3/4) = d-200
d(3/4) = d - 200
200 = d/4
d = 800
It will take an hour for plane A to meet plane B which is flying towards it. If, within 45 minutes, the distance between them will be 200 miles, how far apart are they now?
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