Time value conversion

Sample Excel files are generally better than images - also it helps if you detail some expected results - it's not clear if you want the results as Time values or as Decimal minutes ?

If you want result as genuine Time value

C2:
=LEFT(B2;FIND(" ";B2)-1)/VLOOKUP(REPLACE(B2;1;FIND(" ";B2);"");{"sec"\86400;"min"\1440;"hr"\24};2;0)
copied down

where original entry in B2, format result cells as [m]:ss

If you want Decimal Minutes - as above but multiply result by 1440

C2:
=(LEFT(B2;FIND(" ";B2)-1)/VLOOKUP(REPLACE(B2;1;FIND(" ";B2);"");{"sec"\86400;"min"\1440;"hr"\24};2;0))*1440
copied down

where original entry in B2, format result cells as Number to 2 Decimals

Above is assuming Slovak configuration re: delimiters

Or use a macro for the whole range:

Sub snb()
  [B1:B100] = [if(A1:A100="","",left(A1:A100,find(" ",A1:A100)-1)*choose(find(right(A1:A100,1),"rnc"),60,1,1/60))]
End Sub