EXERCISE 5.2 Complete the following sentences: 1. There are $$ \square $$ seconds in 5 minutes. 2. There are $$ \square $$ minutes in 400 seconds. 3. There are $$ \square $$ minutes in 28 hours. 4. There are $$ \square $$ hours in 107 minutes. 5. There are $$ \square $$ hours in 2460 minutes.

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Let's solve each of the sentences step by step.

1. **There are $$ \square $$ seconds in 5 minutes.**
   - We know that 1 minute = 60 seconds.
   - Therefore, in 5 minutes:
   $$
   5 \text{ minutes} = 5 \times 60 \text{ seconds} = 300 \text{ seconds}
   $$
   - So, the answer is $$ 300 $$.

2. **There are $$ \square $$ minutes in 400 seconds.**
   - We know that 1 minute = 60 seconds.
   - To convert seconds to minutes, we divide by 60:
   $$
   400 \text{ seconds} = \frac{400}{60} \text{ minutes} \approx 6.67 \text{ minutes}
   $$
   - So, the answer is approximately $$ 6.67 $$.

3. **There are $$ \square $$ minutes in 28 hours.**
   - We know that 1 hour = 60 minutes.
   - Therefore, in 28 hours:
   $$
   28 \text{ hours} = 28 \times 60 \text{ minutes} = 1680 \text{ minutes}
   $$
   - So, the answer is $$ 1680 $$.

4. **There are $$ \square $$ hours in 107 minutes.**
   - We know that 1 hour = 60 minutes.
   - To convert minutes to hours, we divide by 60:
   $$
   107 \text{ minutes} = \frac{107}{60} \text{ hours} \approx 1.78 \text{ hours}
   $$
   - So, the answer is approximately $$ 1.78 $$.

5. **There are $$ \square $$ hours in 2460 minutes.**
   - We know that 1 hour = 60 minutes.
   - To convert minutes to hours, we divide by 60:
   $$
   2460 \text{ minutes} = \frac{2460}{60} \text{ hours} = 41 \text{ hours}
   $$
   - So, the answer is $$ 41 $$.

Now, let's summarize the answers:

1. There are $$ 300 $$ seconds in 5 minutes.
2. There are $$ 6.67 $$ minutes in 400 seconds.
3. There are $$ 1680 $$ minutes in 28 hours.
4. There are $$ 1.78 $$ hours in 107 minutes.
5. There are $$ 41 $$ hours in 2460 minutes.
1. 300 seconds 2. 6.67 minutes 3. 1680 minutes 4. 1.78 hours 5. 41 hours

EXERCISE 5.2 Complete the following sentences: 1. There are \( \square \) seconds in 5 minutes. 2. There are \( \square \) minutes in 400 seconds. 3. There are \( \square \) minutes in 28 hours. 4. There are \( \square \) hours in 107 minutes. 5. There are \( \square \) hours in 2460 minutes.

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