Question 749902
Use distance=rate*time.  You can set up a couple equations for d and set them equal to find t.  Then you'll plug back in to find d.

{{{d=24mi/h*t}}}

The time t spent on the bus will be subtracted from 6 (since the total time was 6 hours).  This will give the time spent walking:

{{{d=3mi/h*(6-t)}}}

Now set the two equal and solve for t, then plug the t back into one of the previous equations to find the distance:

{{{24mi/h*t=3mi/h*(6-t)}}}