Adam and Brianna plan to install a new tile floor in a classroom. Adam works at a constant rate of 50 tiles per hour, and Brianna works at a constant rate of 55 tiles per hour. If the new floor consists of exactly 1400 tiles, how long will it take Adam and Brianna working together to complete the classroom floor?
A. 26 hrs. 44 mins.
B. 26 hrs. 40 mins.
C. 13 hrs. 20 mins.
D. 13 hrs. 18 mins.
E. 12 hrs. 45 mins.
The solution to this problem came so easy that I feel like I am making some mistake
Here is how I have solved it:
Combined Rate of A + B = 50 + 55 = 105
Total tiles = 1400
Time needed to finish 1400 tiles = 1400/105 = 13 hours and 35/105 minutes which simplifies to be 13 hours 20 minutes.
So option C.
A. 26 hrs. 44 mins.
B. 26 hrs. 40 mins.
C. 13 hrs. 20 mins.
D. 13 hrs. 18 mins.
E. 12 hrs. 45 mins.
The solution to this problem came so easy that I feel like I am making some mistake
Here is how I have solved it:
Combined Rate of A + B = 50 + 55 = 105
Total tiles = 1400
Time needed to finish 1400 tiles = 1400/105 = 13 hours and 35/105 minutes which simplifies to be 13 hours 20 minutes.
So option C.
