Question 96328
575=60T+80(8-T)
575=60T+640-80T
575=-20T+640
-20T=575-640
-20T=-65
T=-65/-20
T=3.25 HOURS DRIVING @ 60MPH.
8-3.25=4.75 HOURS DRIVING @ 80MPH.
PROOF
575=60*3.25+80*4.75
575=195+380
575=575