Question 343710
Rate*Time=Distance
{{{R*t=D}}}
.
.
.
Plane 1: 
{{{D[1]=R*3}}}
{{{D[1]=3R}}}
Plane 2:
{{{D[2]=2R*3}}}
{{{D[2]=6R}}}
.
.
{{{D=D[1]+D[2]}}}
{{{D=3R+6R}}}
{{{highlight(D=9R)}}}miles