<PRE><B>Question 1151337</B>
:
use the formula, rate * time = distance
:
let r be the rate of the plane
:
3r +2(r-30) = 2540
:
Note the plane flew at the reduced rate for (5-3) = 2 hours
:
3r +2r -60 = 2540
:
5r = 2600
:
r = 520
:
520 * 3 = 1560
:
***************************************************
the plance traveled 1560 km before the wind changed
***************************************************
:
</PRE>