When 0.4 of the total rope was used, the remaining length was 0.69 m (m). Find the length of the first rope in meters (m).
0.69 1 0.4 [OP_SUB] [OP_DIV]
var_a = 0.69
var_b = 1
var_c = 0.4
var_d = var_b - var_c
var_e = var_a / var_d
print('{:.2f}'.format(round(var_e+1e-10,2)))