It is 10 which is b so that’s the right answer
Answer:
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Step-by-step explanation:
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Answer: Option 'B' is correct.
Step-by-step explanation:
Let the initial concentration be

Let concentration after t= 90 hours be N
Since we have given that Sodium-24 has a half life of 15 hours i.e.

So, According to question,

As we know that

Hence, Option 'B' is correct.
Answer: 16 hours
Step-by-step explanation: If 180 miles was completed in 3 hours, it means 60 miles was completed in 1 hour (180 ÷ 3 = 60.) Now we just do 960 ÷ 60 and we get 16 hours of time at a constant speed, assuming no further alterations were made to accelerations.
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