Question 193694
velocity=distance /time
v1=d/3
v2=d/2
v1+v2=d/t  (sum  of  rates  equals  total  rate)
d/3+d/2=d/t
mult  by  6t,,,,,divide  by  d
2t+3t=6
5t=6
t=1.2  min
check
distance =  velocity *time
d1 +d2=d  (distance  at  each  rate  sum  to  total  distance)
(d/3)1.2+(d/2)1.2=d
.4d+.6d=d
d=d ,,,ok