After school, I rode my bike quickly to the academy, and it measured 15 kilometers (km) per hour. I rode at 10 kilometers (km) per hour to get back to school to pick up books after the academy, and it took another 30 minutes longer. How many kilometers (km) is the distance between the school and the academy?
30 60 [OP_DIV] 1 10 [OP_DIV] 1 15 [OP_DIV] [OP_SUB] [OP_DIV]
var_a = 30
var_b = 60
var_c = var_a / var_b
var_d = 1
var_e = 10
var_f = var_d / var_e
var_g = 1
var_h = 15
var_i = var_g / var_h
var_j = var_f - var_i
var_k = var_c / var_j
print(int(eval('{:.2f}'.format(round(var_k+1e-10,2)))))