If 808612 passengers travel everyday through Delhi airport, 505226 passengers travel through Bangkok airport, 682404 passengers travel through Singapore airport and 433867 passengers travel through Hong Kong airport, how many passengers in total travel through these four cities everyday?

Ash-Waite is a comet that orbits around the sun once in 45 years, and Alferno-Princip is a comet that orbits around the sun once in 540 years. The last time they were seen together in the sky was in 1992. In which year will they be seen together in the sky next?

Kelly-Anne's toy car can travel 180 meters in a minute while Kelvina's toy car can travel 18.72 kilometers in an hour. The ratio of the speed of the cars belonging to Kelly-Anne and Kelvina is: