ichewontoes

After 15 minutes the worm will be 15*60*3=2700 cm out of point A. 8-3=5 cm the ant is gaining on the worm each second. 2700/300=9 minutes.

The problem shows that since the masons work at the same rate each Mason covers a third of the front of the house in four days. This means that it does 1/12 of the front in one day. Using this, we see that 16 brick masons will finish one and one third of a house in a day. 60/(4/3) = 45 days.

Mark drives 240+360=600 miles for the whole trip. It took him 12 hours in total and that gives an average of 600/12= 50 mph for the trip.