Ican solve the multiplication can someone me with the second question ?

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

Im literally having a mental breakdown

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points