hi im really confused about these questions i can do whole numbers but not decimals:

Josiah is making rectangular tiles.

The ratio of length:width must always be 5:3

q1. He makes a tile 4.5cm wide how long must the tile be?

1b.He makes a miniature tile in the same ratio with a length of 2.5cm. how wide must the tile be?

Thank you if you can help me asap please.