I rode a bicycle back and forth between the two points A and B, traveling at 15 kilometers per hour (km) on the way and 10 kilometers (km) per hour on the way back, and it took 30 minutes longer to come back. Find the total time it took to come back.
10 30 60 [OP_DIV] [OP_MUL] 15 10 [OP_SUB] [OP_DIV] 30 60 [OP_DIV] [OP_ADD]
var_a = 10
var_b = 30
var_c = 60
var_d = var_b / var_c
var_e = var_a * var_d
var_f = 15
var_g = 10
var_h = var_f - var_g
var_i = var_e / var_h
var_j = 30
var_k = 60
var_l = var_j / var_k
var_m = var_i + var_l
print('{:.2f}'.format(round(var_m+1e-10,2)))