Posted by **roger ** on Friday, August 29, 2014 at 2:04pm.

A man goes upstream for a distance of 10 kms in 5 hours. Another man goes downstream the same distance of 10 kms in 3 hours. what is the difference in speeds of two men if the river speed is 0.5 km/hr

- maths -
**Steve**, Friday, August 29, 2014 at 2:17pm
since distance = speed*time, if the still-water speeds of the men are a and b,

(a-.5)(5) = 10

(b+.5)(3) = 10

5a - 5/2 = 10

3b + 3/2 = 10

b-a = (10 - 3/2)/3 - (10+5/2)/5 = 1/3

- maths -
**roger **, Friday, August 29, 2014 at 3:55pm
Sir, I am also getting this as the answer. but the options given are :-

a). 2.45

b). 2.3

c). 1.33

d). 1.56

- maths -
**manoj**, Wednesday, February 4, 2015 at 9:01am
1.33

- maths -
**pradeep ponduri**, Saturday, September 19, 2015 at 12:59pm
upstream speed =Distance/time

=10/5=2 kmph

downstream speed of =10/3=3.33kmph

difference =3.33-2=1.33

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