If it takes 3 kangaroos traveling at the same speed a total of 18 hours to travel across a highway, how many hours will it take four turtles, each traveling at half the speed of a kangaroo, to do so?
If it takes 3 kangaroos traveling at the same speed, a total of 18 hours to travel across a highway, one kangaroo takes 18/3= 
<gadget id="calculator">18/3</gadget>
<output>6</output>
6 hours to cross the highway.
A turtle traveling at half the speed of a kangaroo will take 2*6 = 
<gadget id="calculator">2*6</gadget>
<output>12</output>
12 hours to cross the highway.
Four turtles will take a total of 4*12 = 
<gadget id="calculator">4*12</gadget>
<output>48</output>
48 hours to travel across the highway.

<result>48</result>