Speed of fly-by-night airplane is 617.5 miles per hour
Solution:
Given that,
The max speed of a fly-by-night airplane is 346 miles faster than a soaring wing airplane
Let "x" be the speed of saoring wing airplane
Then,
Speed of fly-by-night airplane = 346 + x
The sum of their speeds is 889 miles per hour
Therefore,
speed of saoring wing airplane + speed of fly-by-night airplane = 889
x + 346 + x = 889
2x + 346 = 889
2x = 889 - 346
2x = 543
x = 271.5
Thus speed of fly-by-night airplane = 346 + x = 346 + 271.5 = 617.5
Thus speed of fly-by-night airplane is 617.5 miles per hour
