There is a drain through which the water drains consistently. When there were 24.7 liters (L) of water, I opened the drain stopper to drain the water, and after 40 minutes, the amount of water have become 17.1 liters (L). Find how many minutes it takes for all the water to drain out.
24.7 24.7 17.1 [OP_SUB] 40 [OP_DIV] [OP_DIV]
var_a = 24.7
var_b = 24.7
var_c = 17.1
var_d = var_b - var_c
var_e = 40
var_f = var_d / var_e
var_g = var_a / var_f
print(int(eval('{:.2f}'.format(round(var_g+1e-10,2)))))