Please help with the following 2 questions. Similarity transformation statement.

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Me i’m stuck on all these questions besides the two bottom ones