The following table shows the number of days taken by five boys individually to complete a piece of work. If Saurabh and Kirpal work together, find the number of days taken by them to complete the work.
| Boy | Amit | Saurabh | Kirpal | Rishabh | Prithvi |
| No. of days | 25 | 30 | 20 | 35 | 40 |
When is World Book and Copyright Day celebrated?
When is National Panchayati Raj Day observed in India?