You can put this solution on YOUR website!
First, make a table for the given terms:
Let's say airplane A is the one that flies for 400mph and airplane B that flies for 250mph. Since what we are looking for is "how many hours", the column for Time for both A & B will be left unknown and it was because there was no time given on either of the two airplanes. The unknown time will be represented by (t).
Remember these formulas back from your physics (don't worry about physics stuff on this algebra matter. just recall these formulas to help you solve with this kind of question):
Distance = rate x time
v = s/t v = stands for velocity or rate ; s = stands for speed or distance
s = vt
Airplane | Rate | Time | Distance (rate x time)
A | 400mph | t | 400(t)
B | 250mph | t | 250(t)
Total | 1625 miles
Remember to create a table for this kind of question so we could easily identify which is which and accord it to a linear equation.
Then, apply linear equation.
400(t) + 250(t) = 1625 miles
650t = 1625
650t = 1625
t = 2.5 --------> your answer match.
so let's check
just substitute the (t)
400(2.5) + 250(2.5) = 1625
1000 + 625 = 1625
1625 = 1625 ----> correct!
I hope this helps. This is the first question here that i answered. Goodluck!