Did British Empire and Republic of India exist in the same era?

Yes, the two civilizations both existed around 1947 CE.

Which lasted longer, British Empire or Republic of India?

British Empire lasted longer (414 years).

British Empire: Avrupa; Republic of India: Güney Asya

British Empire (1583 CE – 1997 CE) and Republic of India (1947 CE – present) lived in the same era.

	British Empire	Republic of India
Period	1583 CE – 1997 CE	1947 CE – present
Duration	414 years	79 years
Region	Avrupa	Güney Asya
Capital	Londra	Yeni Delhi
Type	Empire	Republic
Government	Anayasal Monarşi	Federal Parlamenter Cumhuriyet
Religion	Hristiyanlık (Anglikan)	Hinduizm, İslam, diğerleri
Language	İngilizce	Hintçe, İngilizce
Peak population	458,000,000	1,400,000,000
Rulers	10	8

The empire with the most extensive territory in history. It was referred to as "the empire on which the sun never sets."

The world's largest democracy. It gained independence through Gandhi's nonviolent resistance movement. Unity in diversity.

Did British Empire and Republic of India exist in the same era?: Yes, the two civilizations both existed around 1947 CE.
Which lasted longer, British Empire or Republic of India?: British Empire lasted longer (414 years).
Which regions did British Empire and Republic of India rule?: British Empire: Avrupa; Republic of India: Güney Asya