Two heavily loaded sixteen-wheeler transport trucks are 855 kilometers apart, sitting at two rest stops on opposite sides of the same highway. Driver A begins heading down the highway driving at an average speed of 90 kilometers per hour. Exactly one hour later, Driver B starts down the highway toward Driver A, maintaining an average speed of 80 kilometers per hour. How many kilometers farther than Driver B, will Driver A have driven when they meet and pass each other on the highway? Choose the correct option:
A) 90
B) 130
C) 135
D) 320
E) 450
I've been reading the website for a while and I'm always keen to see different approaches so I would like to share one that works for me:   Short version:   Truck A travels for an hour.   Distance remaining = 855-90= 
<gadget id="calculator">855-90</gadget>
<output>765</output>
765k   Ratio of speeds 9:8 -&gt; 765/17= 45   Truck A = 90 + 45*9= 
<gadget id="calculator">90 + 45*9</gadget>
<output>495</output>
495   Truck B= 45*8= 
<gadget id="calculator">45*8</gadget>
<output>360</output>
360   Delta= 135km   Answer 135
<result>C</result>
Two heavily loaded sixteen-wheeler transport trucks are 855 kilometers apart, sitting at two rest stops on opposite sides of the same highway. Driver A begins heading down the highway driving at an average speed of 90 kilometers per hour. Exactly one hour later, Driver B starts down the highway toward Driver A, maintaining an average speed of 80 kilometers per hour. How many kilometers farther than Driver B, will Driver A have driven when they meet and pass each other on the highway?