A and B do piece of work in 12 day s but A alone can do that work in 20 day so how many dayst B can do that work
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a+b do the work in 12 days
...... .... .. 1/12... .. 1 .....
a do the work in 20 days
.. ... .. . 1/20 ... 1 .....
b do the( 1/12-1/20) work in 1 day
........ .... . 1 ... ... 1×30= 30 days
...... .... .. 1/12... .. 1 .....
a do the work in 20 days
.. ... .. . 1/20 ... 1 .....
b do the( 1/12-1/20) work in 1 day
........ .... . 1 ... ... 1×30= 30 days
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