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 stillwater speeds of the men are a and b,
(a.5)(5) = 10
(b+.5)(3) = 10
5a  5/2 = 10
3b + 3/2 = 10
ba = (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 =3.332=1.33
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