It takes Abby 3 hours to drive from Ashdown to Bridgeton at an average speed of 60 mph. She then drives 30 miles from Bridgeton to Carton at an average speed of 40 mph. Assuming Abby doesn't stop, what is her average speed from Ashdown to Carton to 1 dp?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.