UPSC CAPF AC 2021 Paper

1 day's work of A and B =

1

20

1 day's work of B and C =

1

30

1 day's work of A and C =

1

24

1 day's work of A,B and C =

1

2

(

1

20

+

1

30

+

1

24

)
=

1

2

×

6+4+5

120

=

1

16

1 day's work of A alone =

1

16

-

1

30

= 15 -

8

240

=

7

240

∴ A alone will complete the work
=

1

7 240

=

240

7

= 34

2

7

days