Question

If working together, brothers Tom and Jack can paint a wall in 4 hours, how much time would it take Jack to paint the wall alone? (1) Jack is painting twice as fast as Tom. (2) If Tom painted twice as fast as he actually does, the brothers would finish the work in 3 hours.

Answer 1

T+J=4 hours
x+2x=4 hours
3x=240 minutes
X=80 minutes