Mandy drove from point A to point B at 60 Km/h. On her way back she drove at 80 Km/h and therefore her way back lasted one hour less. What is the distance (in Km) between A and B?	Choose the correct option:
A) 140.	B) 200.	C) 240.	D) 300.	E) 600.
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=t1-1   thus,   s1t1=s2(t1-1)   60t1=80(t1-1)   t1=4   60*4= 
<gadget id="calculator">60*4</gadget>
<output>240</output>
240   Answer: 240.
<result>C</result>
Mandy drove from point A to point B at 60 Km/h. On her way back she drove at 80 Km/h and therefore her way back lasted one hour less. What is the distance (in Km) between A and B?