Pawan can row 24 km/h in still water. When the river is running at 4.8 km/h, it takes him 1 h to row to a place and to come back. How far is the place?

Pawan's speed downstream = 24 + 4.8 = 28.8 km/h Pawan's speed upstream = 24 - 4.8 = 19.2 km/h Let the required distance be x. According to the question. x/28.8 + x/19.2 = 1 ⇒ (19.2x + 28.8x) / 552.96 = 1 ⇒ 19.2x + 28.8x = 552.96 ⇒ 48x = 552.96 ∴ x = 552.96/48 = 11.52 km