Question

You can assemble a shelving unit every 30 minutes. At this rate how long would it take you to assemble 9 shelving units?

Answer 1

Answer:  The required time taken to assemble 9 shelving units is 4 hours 30 minutes.

Step-by-step explanation:  Given that we can assemble  a shelving unit every 30 minutes.

We are to find the time taken to assemble 9 shelving units at the same rate.

We will be using the UNITARY method to solve the given problem.

We have

Time taken to assemble 1 shelving unit = 30 minutes.

So, time taken to assemble 9 shelving units is given by

$9\times30=270~\textup{minutes}=\dfrac{270}{60}~\textup{hours}=4\dfrac{1}{2}~\textup{hours}=4.5~\textup{hours}=4~\textup{hours }30~\textup{minutes}.$

Thus, the required time taken to assemble 9 shelving units is 4 hours 30 minutes.

Answer 2

9 shelving units is 9 times 1 shelving unit.

If it takes 30 minutes to assemble one shelving unit, it would take 9 times that amount to assemble 9 of them. Multiply 9 by 30 to get your answer in minutes. If you need your answer in hours, since there are 60 minutes in an hour, take the amount of minutes it took and divide it by 60.