Hint:
We have to convert given hours into minutes and seconds. We will multiply the given hours by 60 to convert it into minutes and again multiply minutes by 60 to convert into seconds, as there are 60 minutes in 1 hour and 60 seconds in 1 minute.
Complete step by step solution:
In part (a) we have to convert 143 hours into minutes and seconds.
We know that there are 60 minutes in one hour.
Hence, we will multiply the given hours by 60 to convert it into minutes.
$143 \times 60 = 8580$ minutes.
Also, there are 60 seconds in 1 minute
Now, we will convert minutes into seconds by multiplying the minutes by 60.
$8580 \times 60 = 514,800$ seconds.
So, there are 8,580 minutes and 514,800 seconds in 143 hours.
In part (b) we have to convert 649 hours into minutes and seconds.
We know that there are 60 minutes in one hour.
Hence, we will multiply the given hours by 60 to convert it into minutes.
$649 \times 60 = 38,940$ minutes.
Also, there are 60 seconds in 1 minute
Now, we will convert minutes into seconds by multiplying the minutes by 60.
$38,940 \times 60 = 2,336,400$ seconds.
So, there are 38, 490 minutes and 2,336,400 seconds in 649 hours.
Note:
We can also find the number of seconds in the given hours by directly multiplying given hours by $60 \times 60$, that is 3600. We can also convert minutes into hours by dividing minutes by 60 and check our answers.
