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UKPSC Prelims 2016Paper-IIQ. 40 of 250
Q. 401 markMedium
UKPSC Prelims 2016·Paper-II
A motor-boat whose speed in still water is 15 km/h, goes 30 km downstream and comes back in 4 hours 30 minutes. The speed of the stream (in km/h) is
(a)10
(b)6
(c)5
(d)4