Question 950737
__________________rate__________time_____________distance
FIRST_____________300____________t________________d
SECND_____________400____________t________________d+350


The second plane must overcome both d and the 350 miles behind in the time of t, to catchup with the first plane.  The travel time for this catching-up is the same for both planes, but this is the variable which is asked to be solved.


Using RT=D,


{{{system(300t=d,400t=d+350)}}}


The simple substitution from the first equation gives this equation,
{{{400t=300t+350}}}
easily solvable to find t.