Tyron takes 3/4 hour to paint a wall his brother takes 1/3 of the time he takes how long will his brother take to paint 5 walls

So 3/4 of an hour is 45 minutes (3/4 × 60min)
1/3 of 45 minutes is 15 minutes (1/3 × 45min)

Then for 5 walls, he will take 5 × 15 = 75 minutes

He will take 1 hour 15 minutes to paint 5 walls