Ben visited Hong Kong for his summer holiday. He planned to stay with his uncle in his home in Sha Tin for two weeks. "Excuse me, sir. How long does it take to get from here by taxi to Sha Tin?" he asked a man at the airport. "It takes about forty minutes." said the man. Ben was very careful with his money. He thought, "Uncle John's home is a long way from here. Taking a taxi will be very expensive. I think I'd better take the MTR but I have a heavy bag with me." Then he had an idea. He stopped a taxi and asked, "How much is it to go to this place?" He showed the taxi driver his uncle's address on a piece of paper. "It's about 250 dollars. "said the taxi driver. "Then how much is it for my bag?" Ben asked. "Oh, you only pay five dollars for that." said the taxi driver. "OK. Here's five dollars. Please take my bag to this address. I'll take the MTR." said Ben. "Sorry, sir." said the taxi driver and he drove away.