<PRE><B>Question 896204</B>
Two planes, which are 3080 miles apart, fly toward each other. Their speeds differ by 70 mph. If they pass each other in 4 hours, what is the speed of each?
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let x=speed of faster plane
x-70=speed of slower plane
x+x-70=2x-70=speed at which planes approach each other
distance/speed=travel time
..
3080/2x-70=4
3080=8x-280
8x=3360
x=420
x-70=350
speed of faster plane: 420 mph
speed of slower plane: 350 mph</PRE>