Jinho went to a friend's house to play, so he took the subway for 3 kilometers (km) and 7 meters (m), and then walked a few meters (m). And again, he moved 840 meters (m) by bus, which has a total distance of 6 kilometers (km) and 30 meters (m). Find how many kilometers (km) Jinho walked.
6 1000 [OP_MUL] 30 [OP_ADD] 840 [OP_SUB] 3 1000 [OP_MUL] 7 [OP_ADD] [OP_SUB] 1000 [OP_DIV]
var_a = 6
var_b = 1000
var_c = var_a * var_b
var_d = 30
var_e = var_c + var_d
var_f = 840
var_g = var_e - var_f
var_h = 3
var_i = 1000
var_j = var_h * var_i
var_k = 7
var_l = var_j + var_k
var_m = var_g - var_l
var_n = 1000
var_o = var_m / var_n
print('{:.2f}'.format(round(var_o+1e-10,2)))