It is said that Gyeonghun climbed the mountain at a speed of 3 kilometers (km) per hour when going up, and 4 kilometers (km) per hour when going down as he changed the route, which takes 2 kilometers (km) longer than the previous one. If he took a total of 4 hours for climbing, how long did it take to go up?
4 2 4 [OP_DIV] [OP_SUB] 1 3 [OP_DIV] 1 4 [OP_DIV] [OP_ADD] [OP_DIV] 3 [OP_DIV]
var_a = 4
var_b = 2
var_c = 4
var_d = var_b / var_c
var_e = var_a - var_d
var_f = 1
var_g = 3
var_h = var_f / var_g
var_i = 1
var_j = 4
var_k = var_i / var_j
var_l = var_h + var_k
var_m = var_e / var_l
var_n = 3
var_o = var_m / var_n
print(int(eval('{:.2f}'.format(round(var_o+1e-10,2)))))