There is a hole through which 15 liters (l) of water is drained in 3 minutes at a constant rate. How many minutes does it take for 140 liters (l) of water to drain?
140 15 3 [OP_DIV] [OP_DIV]
var_a = 140
var_b = 15
var_c = 3
var_d = var_b / var_c
var_e = var_a / var_d
print(int(var_e))