59.The
speed of a boat in still water is 8 km/hr. If it speed downstream be 15 km/hr,
then speed of the stream is:
[A]
7.5 km/hr
[C]
9 km/hr
[B]
7 km/hr
[D]
None of these
Answer : [B]
Explanation :
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Speed
of the boat downstream = 15 km/hr.
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Speed
of the boat in still water = 8 km/hr
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Let
the speed of the stream = y km/hr.
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We
have, 15 = 8 + y
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