How do i find this answer (all three of them)?

Tiffany drives 285,120 feet before lunch and 628,320 feet after lunch. about how many kilometers does she drive all together

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !