"I reach masjid just 10-15 min late. So can i pray it alone and will it be accepted?"
As opposed to not praying? The prayer is obligatory on you, and you do not have to pray in congregation even though it has more merit than praying alone. I am sure you see many people praying by themselves when they are late in the mosques, so surely you can easily ask them and discuss there or talk to the Imam of the mosque.
The prayer also has a time-frame within which is it accepted. If you pray it within that time, it will be accepted, provided you have the other conditions of prayer like wudu etc. I would suggest you read some authentic scholarly works on prayer, because these basic questions should not be asked from strangers without doing your due diligence.