Question

Pramod can paint a wall read in 12 hours while Brazilian can whitewash the wall completely in 16 hours if Pramod and brazilian work alternately for an hour each starting when the wall has just cement on it till when it is completely painted red how many hours will it take to paint the entire wall red

Answer 1

# Answer = 95hrs

# Explanation-

Let's consider

In two hours,

In first hour Promod will paint wall.

Promod can paint 1/12 area of wall in one hour.

In second hour Brazilian will whitewash wall.

Brazilian can whitewash 1/16 area of wall in one hour.

That is at the end of two hours,

Wall painted = 1/12-1/16 = 1/48 area.

Hence it'll take 47×2 + 1= 95 hours to paint entire wall.

(wall will be painted at 95th hour so no whitewashing)

Hope this helped...

Answer 2

89 hours will the ans.

Let parmod will start first so parmod done 4 work in one hour.then brajen do 3 work in one hour.therefore only 1 area will be painted red in two hours so till 44 area 88 hours will take and last four area done in one hour so total 88+1=89 hours will take for fully red paint.