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Michael Phelps Maths Problem

Michael Phelps Maths Problem - 13 February

Michael Phelps , the famous swimmer can swim downstream in a lake in exact 40 minutes (with the lake current helping time).
He can swim upstream in a lake in exact 60 minutes (against the lake current).
The length of lake is 2 kilometers.

How long Michael Phelps can cover distance of one side at a still lake (no current).

For Solution : Click Here


  1. 48 minutes.

    Michael Phelps speed = X km/minute
    Lake current speed = Y km/minute

    2/(X+Y) = 40
    2/(X-Y) = 60

    Solving the simultaneous equations gives X = 1/24

    Therefore, to cover 2km will take 2/X = 48 minutes


  2. 48 mintz..!! by usng the eqnz,(x+y)*40 = (x-y)*60 +2!!!