Solve the proportion -4/5 = 8

One integer is 8 times another. if the product is 72, then find the integers

Can someone me and do the problem plz so i can understand it more better

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