Question 702062
The time for each plane is the same, 2.5 hours.
The sum of distance each plane traveled equals 2300 miles.

Format
Plane --------------rate----------time---------distance
Fast plane__________r+100_________2.5__________(r+100)2.5
Slow plane__________r ____________2.5___________ r2.5


Sum of distances, {{{2300=(r+100)*2.5+r*2.5}}}
Solve for r,  the slower plane and then add 100 to find rate of faster plane.