Flying against the wind, an airplane travels 3800 kilometers in 4 hours. Flying with the wind, the same plane travels 3750 kilometers in 3 hours. What is the rate of the plane in still air and what is the rate of the wind?

---- velocity of wind

--- velocity of airplane

Step-by-step explanation:

Given

velocity of airplane

velocity of wind

Flying with the wind, the distance (d) is:

Where d and t are distance travel and time spent with the wind

So:

Divide by 3

Flying against the wind, the distance (d) is:

Where d and t are distance travel and time against with the wind

So:

Divide by 4

Make the subject

Substitute: in

Collect like terms

Divide by 2

Substitute in

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this

the answer would be c:   ax + b = ax + c

step-by-step explanation: