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?
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
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