A medium$-$sized book contains about $1$ million characters. $($a$)$ How many hours would it take to print it on a letter$-$quality printer at $15$ characters per second? $($b$)$ Assuming an average of $55$ characters per line, how many hours would it take on a $600-$line$-$per$-$minute line printer?

Answer: All answers truncated to $2$ decimal places

a$)$ One million characters at $15$ characters per second takes

seconds

This is

hours

b$)$ One million characters at $55$ characters per line takes

lines

The printer prints $600$ lines per minute, so this takes

minutes, which is

hours