Please explain step-by-step:

A new operating system uses passwords that consist of three characters. Each character must be a digit between 0 and 9. For example, three distinct possible passwords are 123, 416, and 999. The system does not use any salt values. The system also allows one login attempt every second and never locks out users regardless of how many failed attempts occur. An adversary has learned there is an account with username Bob and the adversary can attempt to login as Bob. If the adversary uses a brute force attack, what is the expected amount of time to crack Bob's password? (enter a decimal number of seconds) A new operating system uses passwords that consist of three characters. Each character must be a digit between 0 and 9. For example, three distinct possible passwords are 123, 416, and 999. The system does not use any salt values. The system also allows one login attempt every second and never locks out users regardless of how many failed attempts occur. An adversary has learned there is an account with username Bob and the adversary can attempt to login as Bob. If the adversary uses a brute force attack, what is the expected amount of time to crack Bob's password? (enter a decimal number of seconds)