i am getting a error on the Nile Project code line - name drivers is not defined
for driver in drivers:
driver_time = driver.speed * distance
price_for_driver = driver.salary * driver_time
if cheapest_driver is None:
cheapest_driver = driver
cheapest_driver_price = price_for_driver
elif price_for_driver < cheapest_driver_price:
cheapest_driver = driver
cheapest_driver_price = price_for_driver
return cheapest_driver_price, cheapest_driver