What is speed of Ram in still water and speed of river, if Ram covers 20 km in 1 hour swimming downstream and covers the same distance in 2 h swimming upstream?

Options

A. River = 6 km/hr , Ram = 14 km/hr
B. River = 8 km/hr , Ram = 12 km/hr
C. River = 4 km/hr , Ram = 16 km/hr
D. River = 5 km/hr , Ram = 15 km/hr

Answer

D