Latest Bank Exam Aptitude Question SOLUTION: A man row 12.6 km downstream in 36min. River speed is 1/7th of downstream spd. If he goes A to B upstream and return to point A in 4 hour. Find the distance? ???

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A man row 12.6 km downstream in 36min. River speed is 1/7th of downstream spd. If he goes A to B upstream and return to point A in 4 hour. Find the distance? ???

Asked In Bank Exam mini atreya (8 years ago)

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anjali gupta  (8 years ago)

speed of river = y kmph
speed of boat = x kmph
downspeed = x+y
given , y= (x+y)/7
so x = 6y..... (i)
speed = dist / time
x+y = 12.6*60/36 = 21... (ii)
on solving (i) and (ii)
y=3, x=18
total time from A to B and back to A = 4 hours
let d be distance between A and B
4 = t1+t2
4 = d/(x+y) + d/(x-y)
4 = d/21 + d/15
d = 35 Km

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