Answer

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**Hint:**According to the given in the question we have to convert (a) $143$hours and (b)$649$hours. So, first of all we will convert the hours into minutes with the help of the formula as given below:

**Formula used:**1 hour = 60min…………….(1)

Hence, to convert hours to minutes we have to multiply hours with 60.

Now, after converting hours into minutes we have to convert minutes into seconds as asked in the question so, to convert the minutes into seconds we have to use the formula as given below:

1 minute = 60seconds…………..(2)

Hence, to convert minutes to seconds we have to multiply minutes with 60.

**Complete step-by-step answer:**

Step 1: First of all we will convert (a) $143$hours into minutes with the help of the formula (1) as mentioned in the solution hint.

Hence,

$

\Rightarrow 143{\text{hours}} = (143 \times 60)\min \\

\Rightarrow 143{\text{hours}} = 8580\min

$

Step 2: Now, we have to convert the obtained minutes of (a) $143$hours into seconds with the help of the formula (2) as mentioned in the solution hint.

$

\Rightarrow 8580\min = (8580 \times 60)\sec \\

\Rightarrow 8580\min = 514800\sec

$

Step 3: Now, we will convert (b) $649$hours into minutes with the help of the formula (1) as mentioned in the solution hint.

Hence,

$

\Rightarrow 649{\text{hours}} = (649 \times 60)\min \\

\Rightarrow 649{\text{hours}} = 38940\min

$

Step 4: Now, we have to convert the obtained minutes of (b) $649$hours into seconds with the help of the formula (2) as mentioned in the solution hint.

$

\Rightarrow 38940\min = (38940 \times 60)\sec \\

\Rightarrow 38940\min = 2336400\sec

$

**Hence, with the help of formula (1) and (2) we have obtained or converted (a) $143$hours into $8580\min $ and into $514800\sec $ and same as for (b) $649$hours into $38940\min $ and into $2336400\sec $.**

**Note:**To convert hours into seconds we can also multiply the hours with 3600 as we know there are 60min in 1 hour and 60 seconds in 1 minute.

To convert seconds into minutes we have to divide the given minutes by 60 and to convert minutes into hours we have to divide the given minutes by 60.

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