Question 564036
they are travelling at right angles to each other.							
At any given instant they form a right triangle with their starting point							
							
after 2 hours one car is 100 km away from starting point and another car 140 km

leg1 = 	100	km				
Leg2 =	140	km				
						
Hypotenuse^2	100	^2	+	140	^2	
Hypotenuse^2	10000	+	19600			
Hypotenuse^2	29600					
take the square root						
Hypotenuse^2	172.05	km