A ton is about 2000 pounds so 5 tons are about 10000 pounds
8 × 46 = 8 <span>× (40 + 6) = (8 </span>× 40) + (8 <span>× 6) = 320 + 48 = 368
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Drainage started at 12th minute & finished at 15th minute
So, total time taken = 15-12 = 3 minute.
So, your final answer is 3 minute.
Hope this helps!