A container ship left Diego Garcia and traveled toward Tahiti at an average speed of. 10 km/h. Sometime later a cruise ship left
traveling in the opposite direction with an average speed of 20 km/h. After the container ship had traveled for one hour the vessels were 30 km apart. Find the number of hours the cruise ship traveled.
Both ships start from the same position and in the opposite direction. As we know container ship travels 10km/h so it made 10 km distance in 1 hour. Distance is 30 km, then 30 km-10 km=20 km. And 20 km matches 1 hour travel of cruise ship as we know.
