<PRE><B>Question 889903</B>
A train travels 150 miles
in the same time that a plane
covers 400 miles.
if the speed of the plane is 20mph 
less than three times the 
speed of the train;
find both speeds?
***
let x=speed of train
3x-20=speed of plane
travel time=distance/speed (same for both plane and train)
{{{150/x+400/(3x-20)}}}
400x=450x-3000
50x=3000
x=60
3x-20=180-20=160
speed of train=60 mph
speed of plane=160 mph</PRE>