Boats and Streams - Quantitative Aptitude (MCQ) questions for Q. 20762

Q.  A boat running downstream covers a distance of 20 km in 2 hours while for covering the same distance upstream, it takes 5 hours. What is the speed of the boat in still water?
- Published on 07 Jul 17

a. 4 km / hr
b. 7 km / hr
c. 8 km / hr
d. Data Inadequate

ANSWER: 7 km / hr
 
Rate downstream = (20/2) kmph = 10 kmph;
Rate upstream = (20/5) kmph = 4 kmph
Speed in still water = 1/2 (10 + 4) kmph = 7 kmph

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