Boats and Streams - Quantitative Aptitude (MCQ) questions for Q. 21570

Q.  The speed of boat in still water is 20 km/hr. If it travels 26 km downstream and 14 km upstream in same time, what is the speed of the stream?
- Published on 06 May 16

a. 4 km/hr
b. 5 km/hr
c. 6 km/hr
d. 7 km/hr

ANSWER: 6 km/hr
 
Let X be speed of stream
Speed of boat downstream = (20 + X )
Speed of boat upstream = (20 – X)
It is given that boat takes same time to travel 26 km downstream and 14 km upstream
[26/(20 +X)] = [14 / (20 – X)]
520 – 26 X = 280 + 14X
40X = 240
X = 6 km/hr

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