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44.
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The speed of a boat in still water is 10 km/hr. If
it can travel 26 km downstream and 14 km upstream in the same time, the speed
of the stream is:
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A. 1 km/hr
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B. 1.5 km/hr
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C. 2 km/hr
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D. 3 km/hr
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Answer:
D.
Explanation:
Let
the speed of the stream be x km/hr. Then,
Speed
downstream = (10+x) km/hr, Speed upstream = (10 - x) km/hr.
∴ 26/(10+x) =
14/(10-x) ⇔ 260 - 26x = 140
+ 14x ⇔; 40x = 120
⇔ x = 3 km/hr.
