Answer:

Step-by-step explanation:
First, make them on one side of the formula in the form of
which is 
Next, insert the corresponding number in the quadratic formula,
, and the answer can be calculated.
Answer:
5 hours.
Step-by-step explanation:
let they meet after t hours.
310t+380t=3450
690t=3450
69t=345
t=345/69=5
I think its a
because the line segments connect each other.
Distance = Speed x time = 162 x 3 = 486 miles/hour
Answer: 486 miles/hour