Q 1649178913.     A motor boat, whose speed is `15` km/h in still water
goes `30` km downstream and comes back in a total
of `4` h and `30` min. The speed of the stream is

CDS 2015 Paper-2
A

4 km/h

B

5 km/h

C

6 km/h

D

10 km/h

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