I have a test tomorrow and its over rate time and distance. If someone could just explain one problem to me I might get the rest! The question is in the comments! Please help!

Question

anonymous · Answer

Two jets leave Denver at 9:00 am one flying east at a speed 50 km/h greater than the other which is traveling west. at 11:00 am the planes are 2500 km apart. find their speeds. (I need the rate x time = distance chart as well as the answer)

anonymous · Answer

you need a variable for the speed 
how about R for "rate"?

anonymous · Answer

i should be more precise'
how about $R$ for the rate of the slower plane

anonymous · Answer

the faster plane will then have a speed of $R+50$ because it is going 50 mph faster

anonymous · Answer

in two hours they are 2500 miles apart
since distance is rate times time the slower plane travelled $2R$ miles and the faster one $2(R+50)=2R+00$ miles

anonymous · Answer

since the total is $2500$ you know $$2R+2R+100=2500$$ and you can solve that for $R$

anonymous · Answer

Wait where did you get the 2 from??

anonymous · Answer

two hours

anonymous · Answer

from 9 to 11 is two hours, so the time is $2$

anonymous · Answer

go R miles per hour for two hours distance is $2R$

anonymous · Answer

Oh I see! so |dw:1446692215114:dw| is that correct?