[update] ) • 11,463 /km 2 (29,689 /sq mi) • 15.9 million [ 2 ] (2007 [update] ) Language(s) English , Hindi , Urdu , Punjabi , Bengali Time zone IST ( UTC+5:30 ) Area • Elevation 1,484 km 2 (573 sq mi) • 239 m (784 ft) [ 3 ]