user: Question: What is the sum of tonnage with a time at 00:10 and less than 42 casualties?
Columns: ['Date', 'Time', 'Name', 'Flag', 'Casualties', 'Tonnage (GRT)', 'Cargo', 'Sunk by...']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'text', 'text']
Sample row: ['9 Sept 1941', '06:55', 'Empire Springbuck', 'United Kingdom', 42.0, 5591.0, 'Steel and explosives', 'U-81']
SQL:

assistant: SELECT SUM("Tonnage (GRT)") FROM "Table" WHERE "Time" = '00:10' AND "Casualties" < 42.0;