400 mL
Capacity of 5 cups=2 litres
When we convert a larger unit (L) to a smaller unit (mL), we multiply the given measure by powers of 10.
∴Capacity of 5 cups=2×1000 mL (∵1 litre=1000 mL)
=2000 mL
⇒Capacity of 1 cup=20005 mL
=400 mL
Thus, the capacity of 1 cup equals 400 mL.