A motorboat travels 378 kilometers in 6 hours going upstream and 735 kilometers in 7 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Im literally having a mental breakdown

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same

The quotient of 15 and a number is 1 over 3 written as an equation