Question

16. Gauri takes 5 hours to paint a wall and Garima takes 6 hours to paint the same wall. How long
will they take to paint the wall
, if they work together? If Gambhir helps Gauri and Garima finish
painting the wall and they all together take 3 hours to paint the same wall, find the time taken by
Gambhir alone to paint the same wall.​

Answer 1

Answer:

Gour in 5 hours do the work.

in 1hour gouri does 1/5 th parts of the work.

Garima takes 6 hours to complete the work.

In 1 hour Garima does 1/6 th parts of the work.

Together in 1 hour Gouri and Garima do 1/5+1/6=11/30 parts of work

To complete 11/30 parts of work they take 1hour

To complete full work they take 1×30/11=2.72hours

so in 2.72hours they complete the work