Answer: in 10 years
Step-by-step explanation: The defendant serving a concurrent sentence will serve the diff sentences at the same time.
He is to serve 3 year for assault and 10 years for burglary. This means that he will spend the first 3 years serving a jail term for both assault and burglary while the rest of the 7 years he will serve for only burglary.
This is a judicial way of punishing offenders of different crimes without serving their jail terms differently.