Question

A teacher graded 3/4 of class papers in 2 hours and 15 minutes. At this rate whole long does it take him to grade all papers of this class?

PLS HELP ME

Answer 1

The answer is 3 hours

Explanation:

Answer 2

T=180minutes or 3 Hours

Explanation:

Given the teacher was able to grade 3/4 of the class papers in 2hours and 15 minutes. Let there be x number of children in the class. Now convert the time into one unit ie, minutes .

1 hour=60 minutes

2 hours=120 minutes.

total time taken by the teacher to grade 3/4 of the class papers is=120+15=135minutes.

Now

3/4 of the class papers graded in 135 minutes.

let the time taken to grade all the papers is T; then

`3/4x--->135`

`x--->T`

On cross multiplication we get

`135*x=T*(3x/4)`

`T=135*4/3`

`T=180` minutes.

Therefore the total time taken by the teacher to grade all the papers in the class is 180 minutes or 3 Hours.