Question

answer this question

Answer 1

Step-by-step explanation:

5 worker paint 1/4 of wall in 12 hr

1 worker will paint 1/4*1/5(=1/20) of wall in 12 hr

now in 12 hr 1/20 of wall painted by 1 worker

so in 1 hr 1/20*1/12(=1/240) of wall will be painted by 1 worker

so option A is correct