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March 27, 2017

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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 - ,

    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 - ,

    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 - ,

    1.33

  • maths - ,

    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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