<span>The answer is THREE FEET. This is part of the safety precautions that must be taken when using ladder. Other safety precautions include: only used inspected and certified ladders, keep ladders at least ten feet away from power lines, do not use ladder on slippery surfaces, etc.</span><span />
<em><u>Answer</u></em>
5 hours
<em><u>Explanation</u></em>
The two working together can finish a job in

Also, working alone, one machine would take one hour longer than the other to complete the same job.
Let the slower machine working alone take x hours. Then the faster machine takes x-1 hours to complete the same task working alone.
Their combined rate in terms of x is

This should be equal to 20/9 hours.

Multiply through by;





Factor to get:


It is not feasible for the slower machine to complete the work alone in 4/9 hours if the two will finish in 20/9 hours.
Therefore the slower finish in 5 hours.
That is a true statement. Hope this was helpful!
True because printers, which require paper, are becoming more expensive. A paperless society has the advantage of being cheaper in this aspect.