Question 267398
A car traveling on a road that is perpendicular to a railroad track.
 When the car is 30 meters from the crossing, the car's new collision 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?
:
This is a pythag problem: a^2 + b^2 = b^2
Where:
c = 50, 
a = 30
b = dist the train is from the crossing
:
30^2 + b^2 = 50^2
900 + b^2 = 2500
b^2 = 2500 - 900
b^2 = 1600
b = {{{sqrt(1600)}}}
b = 40 meters, is the train from the crossing