Question 905240
345=3*(x+y)
x+y=115
x-y=23
2x=138
x=69
y=46

check
345=69*t+46*t
345=115*t
t=3 hours
The total time for car from b to meet the car from a is 3 hours
d=R*t
d=46*3
d=138+0
d=138 miles from b at 46 mph
d=r*t
d=69*3
d=207 miles from  a at 69 mph