Latest Bank Exam Aptitude Question SOLUTION: A man row 12.8 km downstream in 32 min. River speed is 1/8th of downstream spd. If he goes A to B upstream and return to point A in 3.5 hour. Find the distance? ???

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A man row 12.8 km downstream in 32 min. River speed is 1/8th of downstream spd. If he goes A to B upstream and return to point A in 3.5 hour. Find the distance? ???

Asked In Bank Exam mini atreya (9 years ago)

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anjali gupta  (9 years ago)

speed of river = y kmph
speed of boat = x kmph
downspeed = x+y
given , y= (x+y)/8
so x = 7y..... (i)
speed = dist / time
x+y = 12.8*60/32 = 24... (ii)
on solving (i) and (ii)
y=3, x=21
total time from A to B and back to A = 4 hours
let d be distance between A and B
3.5 = t1+t2
3.5 = d/(x+y) + d/(x-y)
3.5 = d/24 + d/18
d = 36 Km (Answer)

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