Question 905595
Gaining speed 12 -8= 4f/s
Headstart 8*40 =320 ft
Time to catch up 320/4=80 sec
Algebraic solution
8(t+40)=12t
8t+320=12t
320=12t-8t
320=4t
t=80  sec
Distance to meeting 80*12=960 ft