The history and discovery of River Niger

The Congo River Basin: Home of the deepest river in the world

Niger River's importance to western Africa explained | Britannica

Niger River - Alchetron, The Free Social Encyclopedia

Where did river Niger and river Benue join together? - TimesMojo

A river has a steady speed of 0.500 m / s . A student swims upstream a distance of 1.00 km and swims back to the starting point. ( a) If the student can swim at a speed of 1.20 m / s in still water, how long does the trip take? (b) How m much time is required in still water for the same length swim? (c) Intuitively, why does the swim take longer when there is a current? | Numerade