Gary drove from point A to point B at 60 Km/h. On his way back he took a train travelling at 110 Km/h and therefore his trip back lasted 5 hours less. What is the distance (in Km) between A and B? Choose the correct option:
A) 600.  B) 630.  C) 660.  D) 690.  E) 720.
distance=speed*time   d1=s1t1   d2=s2t2   The distance from point A to point B is the same for each trip so,   d1=d2 and   t2=t1-5   thus,   s1t1=s2t2   60t1=s2(t1-5)   t1=11   60*11= 
<gadget id="calculator">60*11</gadget>
<output>660</output>
660   Answer: 660.
<result>C</result>
Gary drove from point A to point B at 60 Km/h. On his way back he took a train travelling at 110 Km/h and therefore his trip back lasted 5 hours less. What is the distance (in Km) between A and B?