Please stop attaching a rainbow table, and help me answer these questions, muchly appreaciated !!!!

20.2. Given a password that is 15 characters long where each character can be one of the 52 upper- and lower-case letters, 10 digits or 32 punctuation sym- bols and assuming each hash requires 1 ns, compute the total time consumed in a brute force attack. 20.3. Given the data in Problem 20.2, compute the size of the hard disk needed to house a rainbow table if each hash is 512 bits in length. 20.4. Using the information in Problem 20.2 and assuming that each password has a 16 byte salt and each hash requires 1 ns, compute the total time needed for a brute force attack. 20.5. Given the data in Problem 20.2 and the fact that each password has a 16 byte salt, determine the size of the hard disk that is needed to house a rainbow table assuming each hash is 512 bits in length