Answer:
Explanation:
P is the speed of the plane.
W is the speed of the wind.
We really need to know when the plane was flying against the wind:
on the 2345 mile flight or on the 860 mile flight?
If the distances were the same, we can tell by the times,
as the wind will slow down the plane.
But they are different, so we can't.
A typical plane flies around 500 mph.
2345/3.5 = 670 while 860/2 = 430.
So judging by these speeds, it appears as though
the plane was flying with the wind on the 2345 mile
flight.
Proceeding as such, using these calculations
of dividing by the times:
2345 = (P +w)*3.5 ---> 670 = P + w
860 = (P-w)*2 ------> 430 = P-w
Adding these equations together:
1100 = 2P
P = 550
w=120
A) 550+120 = 670
B) 550-120 = 430
C) and D) done above
E) wind speed is 120
F) plane speed is 550