计算题.
1.At 12 noon my watch was correct. However, it then started to lose 18 minutes per hour.
Four hours ago it stopped completely and is now showing the time as 15:30.
What is the correct time now?
Answer:
_____________________________________________________________2.
![](http://thumb2018.1010pic.com//pic1/upload/papers/g03/20120815/201208151704227336024.png)
What value of weight should be placed on the scales to balance?
Answer: _____________________________________________________________