<PRE><B>Question 194250</B>
A car is traveling on a road that is perpendicular to a railroad track 
when a car is 30 meters from the crossing, the cars new collison detector
 warns the driver that there is a train 50 meters from the car and heading
 toward the same crossing. how far is the train from the crossing?
:
The this is a pythag problem a^2 + b^2 = c^2
Let a = 30 (car from the crossing)
Let c = 50 (car to oncoming train)
find b (train to crossing)
:
30^2 + b^2 = 50^2
900 + b^2 = 2500
b^2 = 2500 - 900
b^2 = 1600
b = {{{sqrt(1600)}}}
b = 40 meter, train is from the crossing</PRE>