People don't do their homework . You cannot learn by reading or copying problem solutions any more than you can learn to swim or play the piano by watching someone else.
Timing is important.
If you still can't do a problem, seek help immediately. This is a time-consuming process, but is important for the learning process. Study all text examples carefully, filling in the missing steps and checking units at all stages. In some cases it will be helpful to work them out using a calculator. Students are reminded that, by faculty senate rule, the minimum penalty for cheating is an F for the entire course.