Boats and Streams - Quantitative Aptitude (MCQ) questions for Q. 55

Q.  A boatman rows 96 km downstream in 8 hours with a stream speed of 4kmph. How much time will he take to cover 8km upstream?
- Published on 12 Jun 15

a. 4 hours
b. 6 hour
c. 2 hours
d. 1 hours

ANSWER: 2 hours
 
Speed = distance/time

Speed downstream: 96 / 8 km/hr = 12kmph

Speed of stream = 4kmph

Effective speed of boat = (12-4) kmph
= 8kmph

Distance to be travelled upstream= 8 km

Speed upstream = boat speed-current speed

= 8-4 kmph

= 4 kmph

Time taken = distance/speed = 8/ 4 hours
=2 hours

Thus it will take 2 hours to go upstream.

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