A surveyor measured the distance between two stations as 1500 m using 30-meter chain. He later observed that the same distance when measured with 20-meter chain was found to be 1515 m. If the 30 m chain was 0.075 m too short, then the error in the 20 m chain will be?
1
- 0.25 m
2
+ 0.25 m
3
- 0.15 m
4
+ 0.15 m