Question

please solve it......

Answer 1

Let your speed be x Km/h
Distance = 2 km

We are given,

            2/x - 2/x+1 = 10/60  [∵Time = Distance/Speed]
           2/x - 2/x+1 = 1/6

 so,    12[1/x - 1/x+1] = 1
      so, 12[x+1 -x/(x)(x+1) ] = 1
        so, 12[1]/x² + x = 1
              so, x² + x - 12 = 0

 so,     x² + 4x - 3x - 12 = 0
       so, x(x+4) -3(x+4) = 0
    so, x = 3, -4

But speed can't be negative 


Hence, your rate of walking = 3 Km/h