It takes one examiner 15 hours to mark 80 exam papers. How long should it take 5 examiners to mark 80 exam papers

It will take 3 hours for 5 examiners to mark 80 papers.

Step-by-step explanation:

Given:

Time taken by an examiner to mark 80 exam papers = 15 hours

To find time taken by 5 examiners to mark 80 exam papers.

Solution:

Applying unitary method.

One examiner takes 15 hours to mark 80 exam papers

So, in one hour he can mark =  papers

In hour 5 examiners can mark = papers

So, we know 5 examiners can mark   papers in 1 hours.

So, to mark 1 paper they will take = = of a paper

Thus, to mark 80 papers they will take = hours.

Thus, it will take 3 hours for 5 examiners to mark 80 papers.

f

step-by-step explanation:

f

d

step-by-step explanation:

i used the pitagoras theoreme