A and B are 90 km apart they start to move each other simultaneously A at speed 10 and B at 5 km/hr if every hour they double their speed what is distance that A pass until he meet B?	Choose one
A) 30 km  B) 40 km  C) 50 km  D) 60 km  E) 70 km
in 2 hours a covers  (10+20)= 
<gadget id="calculator"> (10+20)</gadget>
<output>30</output>
30 km   b covers  ( 5+10)= 
<gadget id="calculator">  ( 5+10)</gadget>
<output>15</output>
15 km, total covered=45   in the next hour they have to cover (90-45) km with the speeds 40km/hr and 20 km/hr respectively   let them take another t hrs to meet   so sum of the distance to be covered by both is 45km   (40*t)+(20*t)=45km   gives t= (3/4) hrs   we need to fid out the distance covered by a   which equals to =30+(40*(3/4))= 
<gadget id="calculator">30+(40*(3/4))</gadget>
<output>60</output>
60 km   ANSWER:60 km
<result>D</result>
A and B are 90 km apart they start to move each other simultaneously A at speed 10 and B at 5 km/hr if every hour they double their speed what is distance that A pass until he meet B?