Question

It takes me 2 minutes to complete a math problem(some problems take me less time; some take memore time). How long did it take me, in hours, to do550 problems?

Answer 1

It takes him 2 minutes to complete a math problem. The number of minutes he will use for 550 math problems can be computed below

`\begin{gathered} \text{1 math problem = 2 minutes} \\ 550\text{ math problem = 550}*2=1100\text{ minutes} \\ 60\text{ minutes = 1 hour} \\ 1100\text{ minutes = }(1100)/(60)=18.33\text{ hours} \end{gathered}`

It will take him 18.33 hours to do 550 math problems(He could use a little less or more than 18.33 hours because some problems might take less or more than the calculated 2 minutes per math problem).