Question

Rahm spent 2 1/2 hours writing an essay. It took him 4 times as long to finish his science project. How long did it take rahm to write the essay and finish the science project.

Answer 1

let's do the math, 2.5+2.5+2.5+2.5( 4times) is 10hrs+2.5= 12.5hrs

Answer 2

Time taken by Rahm to write the essay and finish the science project = 12.5 hours

Explanation:

`\text{Time spent by Rahm on writing the essay = }2\tfrac{1}{2}=(5)/(2)\:\:hours\\\\\text{Now, Rahm took 4 times as long to finish the science project}\\\\\implies\text{Time took by Rahm to finish the science project = }4* (5)/(2)=10\:\:hours`

Now, we need to find the total time spent by Rahm to finish the both writing the essay and the science project.

`\text{Therefore, Total time taken by Rahm = }(5)/(2)+10=(25)/(2)\:\:hours`

Hence, Time taken by Rahm to write the essay and finish the science project = 12.5 hours