I think the answer is D sorry if it’s wrong and good luck
Answer:
you all have to divide by 2
Step-by-step explanation:
602.88÷2= 301.44
X = velocity of plane
y = velocity of wind
x - y = 1680/5 = 336 mph .....(1) [ plane flying against the wind]
&
x + y = 1680/4 = 420 mph....(2) [ plane flying with the wind]
Adding (1) and (2) to eliminate y gives
2x = 756
x = 378 mph is the speed of the plane with no wind.