Let
x--------> the time in hours
y-------> the distance in miles
we know that
The speed is equal to

in this problem


<u>Equation First Train</u>

<u>Equation Second Train</u>

 ---------> equation
 ---------> equation 
Substitute the values of  and
 and  in the equation
 in the equation 

Solve for x


therefore
<u>the answer is</u>

 
        
                    
             
        
        
        
Answer:
80 cups
Step-by-step explanation:
4 x 4 =16
16x 5= 80 cups
 
        
                    
             
        
        
        
15 is the awnser too this one
        
             
        
        
        
Answer:
W = X in.
L = (3x - 6) in.
A = L*W = (3x-6)X = 45,
3x^2 - 6x = 45
3x(x-2) = 45,
x(x-2) = 15,
x^2 - 2x - 15 = 0
(x-5)(x+3) = 0,
x-5 = 0,
x = 5 in.
x+3 = 0,
x = -3.
Solution Set: x = 5, and x = -3.
Select + value of X:
x = 5
W = x = 5 in.
L = 3x-6 = 3*5 - 6 = 9 in.
Step-by-step explanation: