Posted by Nabil on .
two buses leave at the same time.
one travels west at 40 mph.
the other goes north at 30 mph.
When will they be 400 miles apart?

algebra 
tchrwill,
(30t)^2 + (40t)^2 = 400^2

algebra 
T U BHARGAV,
30t+40t=400
70t=400
t= 400/70
=5.71hrs
After 5.71hrs they will be at 400miles apart. 
algebra 
TTBK_Automatic,
Deez N***