Latest Infosys Aptitude Question SOLUTION: A man goes upstream in a certain place in 3 hours. Another man covers the same distance in downstream in 5 hours. The speed of river is 10km/hr. The speed difference between them?

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A man goes upstream in a certain place in 3 hours. Another man covers the same distance in downstream in 5 hours. The speed of river is 10km/hr. The speed difference between them?

Asked In Infosys asxa asxaxax (10 years ago)

Unsolved Read Solution (3)

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Read Solution (3) :

Nalini Chimata  (10 years ago)

i think ans is 20km/hr

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Snehasis  (10 years ago)

Answer is 40km/h.

let y is the speed of the stream, where y=10km/hr(given)

let a is the time taken by first man to cover some distance, where a=3 hours(given)

let b is the time taken by second person to cover same distance as first, where b=5 hours(given)

According to the formula, y(a+b)/(b-a) = 10(3+5)/5-3 = 40km/hr

their is no need to subtract 10 from 40 as its the speed of the stream which automatically adds to the speed of the person.

therefore answer is 40km/hr.

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pradeep tomar  (10 years ago)

answer is 30

(x+10)*3 = (x-10)*5
gives x=40
40 - 10 gives the difference of 10 kmph
formula used:
upstream= (speed of boat -speed of stream)
downstream=(speed of boat +speed of stream)
hoe its clear now!

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