Question 710560
 length = 4 times width
  l = 4 b
perimeter of the pool = 140
 but perimeter of the rectangle  = 2(l+b)
                                so 2(l+b)= 140
                        l+b = 70
                        put l= 4b
        4b+b= 70
   5b =70
  b= 14
  l= 4*14
     =56
 so length = 56 m
      width = 14 m