A train travelled from point A to point B at 160 Km/h. On its way back the train travelled at 120 Km/h and therefore the trip back lasted one hour longer. What is the distance (in Km) between A and B?  Pick
A) 480.	B) 500.	C) 510.	D) 600.	E) 800.
distance=speed*time   d1=s1t1   d2=s2t2   The distance from point 480. to point B is the same for each trip so,   d1=d2 and   t2=t1+1   thus,   s1t1=s2(t1+1)   160t1=120(t1+1)   t1=3   160*3= 
<gadget id="calculator">160*3</gadget>
<output>480</output>
480   480.nswer: 480.
<result>A</result>
A train travelled from point A to point B at 160 Km/h. On its way back the train travelled at 120 Km/h and therefore the trip back lasted one hour longer. What is the distance (in Km) between A and B?