0 votes 0 votes A boatman goes $2$ km against the current of the stream in $1$ hour and goes $1$ km along the current in $10$ minutes. How long will it take to go $5$ km in stationary water? $40$ minutes $1$ hour $1$ hr $15$ min $1$ hr $30$ min Quantitative Aptitude nielit2017july-scientistb boat-stream + – Lakshman Bhaiya asked Mar 30, 2020 • edited Jun 6, 2020 by go_editor Lakshman Bhaiya 13.7k points 912 views answer comment Share See all 0 reply Please log in or register to add a comment.
2 votes 2 votes let s = boatman’s speed in still water , r = river’s flow(speed) s+r = 2 kmph (speed = distance/time) s-r = 6 kmph(convert time given in minutes into hour) thus , s=4kmph hence, time = 5/4 hrs = 1.25 hr = 1 hour 15 minutes Shivendu Gupta answered Apr 12, 2020 Shivendu Gupta 58 points comment Share See all 0 reply Please log in or register to add a comment.