Please help I need this to be finished td and I’d know to do it (will brainlist)

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

This is about circle theorems. someone asap : (

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)