Gap of 3 saffs between two saffs

Q: If in congregational prayers and Jumu'ah and Eidain, the Imam is in the indoor hall of the masjid and saffs are made behind him and the door of the hall is closed but not locked and saffs are also made outside, but there is a distance of 3 saffs between the last indoor saff and the first outdoor saff, are the congregational prayers or Jumu'ah or Eidain prayers valid?

Using interest money to fix potholes and to pay off interest of a bond

Q: I wanted to find out about the following to questions regarding interest.

1. Is it permissible to hire out people with interest money to repair potholes which the government supposed to do and are not doing so. Would it affect the maslah if the person who gave the interest money to repair the roads is also using the roads and taking benefit from this interest money?

2.Can a person use interest money to pay off the interest of a bond?

Ownership of money given to one's child

Q: I am almost 16 years old. My parents give me pocket money every month. When they give me this money, do I become the Maalik (owner) of that money or does it remain under the ownership of my parents?

If sometimes they need some money, they ask me to lend them some money as loan. And if my mother thinks that I am not spending my money right, she takes my purse and money from me and keeps it with her and returns it after some time.

If I save that money over time and buy an online course with that money. The online course is about how to earn money online. So, if I learn from that course how to earn money online and then I earn money online, will that money which I earn, be considered under my ownership or my parents ownership? Because if it is in my parents ownership then it will be divided in Wirasat.