送交者: 假大佬 于 September 28, 2006 17:24:41:
看你每道题用多长时间答对. 十分钟内全答对你就绝牛了：
1. You are in a rowing boat on a lake. A large heavy rock is also in the boat. You heave the rock overboard. It sinks to the bottom of the lake. What happens to the water level in the lake? Does it rise, fall or stay the same ?
2. Two trains enter a tunnel 30 miles long travelling at 100 mph at the same time from opposite directions. As soon as they enter the tunnel a fly flying at 180 mph starts from one train and heads toward the other one. As soon as
it reaches the other one it turns around and heads back toward the first, going back and forth between the trains until the trains pass in the middle of the tunnel. How far did the fly travel?
3. You are provided 2 unequal lengths of rope and told that both take exactly 1 hour to burn from end to end, although they don’t necessarily do so in a uniform fashion. How would you go about measuring an exact 15 minute period?