How many knots is 1 speed of sound?

1  speed of sound  =  666.74  knots  2  speed of sound  =  1,333.48  knots  3  speed of sound  =  2,000.22  knots  4  speed of sound  =  2,666.95  knots  5  speed of sound  =  3,333.69  knots  6  speed of sound  =  4,000.43  knots  7  speed of sound  =  4,667.17  knots  8  speed of sound  =  5,333.91  knots  9  speed of sound  =  6,000.65  knots  10  speed of sound  =  6,667.39  knots  11  speed of sound  =  7,334.13  knots  12  speed of sound  =  8,000.86  knots  13  speed of sound  =  8,667.60  knots  14  speed of sound  =  9,334.34  knots  15  speed of sound  =  10,001.08  knots  16  speed of sound  =  10,667.82  knots  17  speed of sound  =  11,334.56  knots  18  speed of sound  =  12,001.30  knots  19  speed of sound  =  12,668.03  knots  20  speed of sound  =  13,334.77  knots  21  speed of sound  =  14,001.51  knots  22  speed of sound  =  14,668.25  knots  23  speed of sound  =  15,334.99  knots  24  speed of sound  =  16,001.73  knots  25  speed of sound  =  16,668.47  knots  26  speed of sound  =  17,335.21  knots  27  speed of sound  =  18,001.94  knots  28  speed of sound  =  18,668.68  knots  29  speed of sound  =  19,335.42  knots  30  speed of sound  =  20,002.16  knots  31  speed of sound  =  20,668.90  knots  32  speed of sound  =  21,335.64  knots  33  speed of sound  =  22,002.38  knots  34  speed of sound  =  22,669.11  knots  35  speed of sound  =  23,335.85  knots  36  speed of sound  =  24,002.59  knots  37  speed of sound  =  24,669.33  knots  38  speed of sound  =  25,336.07  knots  39  speed of sound  =  26,002.81  knots  40  speed of sound  =  26,669.55  knots  41  speed of sound  =  27,336.29  knots  42  speed of sound  =  28,003.02  knots  43  speed of sound  =  28,669.76  knots  44  speed of sound  =  29,336.50  knots  45  speed of sound  =  30,003.24  knots  46  speed of sound  =  30,669.98  knots  47  speed of sound  =  31,336.72  knots  48  speed of sound  =  32,003.46  knots  49  speed of sound  =  32,670.19  knots  50  speed of sound  =  33,336.93  knots 
