Question

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

gauri takes 5 hours to paint the wall.

In 1 hour, Gauri will paint ( 1 / 5 ) of the wall.

garima takes 6 hours to paint the wall.

In 1 hour, Garima will paint ( 1 / 6 ) of the wall.

Adding the part of wall Gauri and Garima paint in 1 hour,

( 1/5 + 1/6 )

( 6/30 + 5/30 )

( 11 / 30 )

Hence in 1 hour, Gauri and Garima will together paint ( 11 / 30 ) of the wall.

thank u :-)