J8 (Reigate/Redhill) to J23 (A1M) is 56 miles.
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Nine motorways intersect with the M25; J3 : M20 J5 : M26 J7 : M23 J12 : M3 J15 : M4 J16 : M40 J21 : M1 J23 : A1(M) J27 : M11
M25
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It is 5*sqrt(m).
It depends on the Grade of Concrete. general grades are M15, M20, M25 etc. here are the nos. of bag required -------------------Bag for 1 cum---------------Bag for 5 cum M15------------------- 6.4----------------------------32 M20-------------------- 8-----------------------------40 M25--------------------12----------------------------60