College roommates John and Dave were driving home to the same town. John drove 48 mph, and Dave, who left 3 hrs later, drove at 60 mph. How long will it take for Dave to catch up to John?​

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis