Question

Tim can paint three 10 ft. by 12 ft. walls in 4 hours. He has to paint his house, and it has 9 walls this size that need to be painted. If he starts at 10:00 a.m., about what time will Tim finish?

A. 9:00 p.m.
B. 9:30 p.m.
C. 10:00 p.m.
D. 10:30 p.m.

Answer 1

It would take him 12 hours, so he would finish at 10 p.m.

Answer 2

C. 10:00 p.m.

Explanation:

Since it is given that Tim is taken 4 hours time to complete painting in 3 walls.

Thus, time taken to complete painting in one wall is:
`(4)/(3)` hours

No, Tim has to complete painting in 9 walls.

Thus time taken to complete painting in 9 walls =
`(4)/(3)* 9 = 12 \ hours`

Also since he start his work at 10:00 a.m.

So he has to work till 10:00 a.m. + 12 hours = 10:00 p.m.

Hence Option C is correct.