Ram, Shyam & Mohan working together can complete a job in $1$ day. Shyam needs $1$ day less than ram to complete the work. The work also gets completed if ram & mohan start working together, if both work for $1$ day and mohan works for additional $3$ days to complete the work. By what percentage shyam is more or less efficient than ram. (Two decimal places)

Ten people can do a work in $30$ days. In how many days, can 15 people complete double the work - 

1.$40$

2. $25$

3. $20$

4. $45$ 

G is twice as fast as S in doing work. If G can do a work in $30$ days less than S, how many days will they take to complete the work together? 

1.$25$
2. $20$
3. $22$
4.$15$ 

X can do 5 times faster work than that of Y and so it takes 36 days less than Y. Find the time in which X alone can complete the work?