The speed of a boat in still water is 5 km/hr. If it takes t

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The speed of a boat in still water is 5 km/hr. If it takes thrice as much time in going 20 km upstream as in going the same distance downstream, find the speed of the stream.

[MBA CMAT 2019]

A 5.5 km/hr

B 2.5 km/hr

C 3.5 km/hr

D 4.5 km/hr