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 
Substitute the values of
and
in the equation 

Solve for x


therefore
<u>the answer is</u>

Answer:
7.6
Step-by-step explanation:
I used a calculator
Answer:
a............................................................................................................
Step-by-step explanation:
Answer:
D is the polynomial. A is a binomial with only 2 terms, as is B and C. D is a trinomial with three terms, and is considered a polynomial.
Hope this helps!