Answer:
Step-by-step explanation:
Write a system of equations to model the situation. Add the equations to eliminate the y-term and then solve for x. Substitute the value for x into one of the original equations to find y. Check your answer by substituting x = 8 and y = 2 into the original system.
7 and a half hours
Explanation-
8/5=1.6
12/1.6=7.5
I think is
(x + y ) ( 2x - xy + 2y)
2x2 - x2y + 2yx + 2xy - xy2 + 2y2
round it to a whole number of 100 m witch i think would be 15700 m
also i dint realize it said round it to a whole number and to 100 m so it would also be a whole number of 16000 i think if not this than 20000