40t +35t =50 (t=travel time in hours) t= 50/75 t= 2/3 travel time = 2/3 of an hour, 40 min. 5:40. QED
40t +35t =50 (t=travel time in hours) t= 50/75 t= 2/3 travel time = 2/3 of an hour, 40 min. 5:40. QED