Q207
In 3 m of immediate roof of an coal in u/g, bottom 2 m layer of sand stone of fine grained layer, has an RMR of 45, while upper 1 m of coarse grained sand stone has RMR of 30. What will be the over all RMR of the immediate roof?
A.
60
B.
50
C.
30
D.
20
E.
40
AnswerAnswer: Option E
Solution
Answer: Option E
No explanation is given for this question Let's Discuss on Board