.
Clearly, the person on the bottom step of the ladder is D

As per the given information, the five persons seated in decreasing order of their heights are as shown below 
E D C A B 
E is tallest 
B is smallest 
C is mid position 
Clearly, C will occupy the mid position.

The arrangement is as shown below: 
Left 1.......10 11th .........10th 9.....1 A B 
Now they interchange their positions 
Left 1................10 11th ...................19, 18 th B A 
Therefore, Total number of persons in a row 
= 17+9+1= 27 persons 
And total persons in arrow other than A and B =27-2 =25 persons 
As the positions of A and B are 18th and 10th in respective arrangements.

Since in a class, 60 boys are twice that of girls in a class of 60, 
boys =40 And girls =20 
It is given that alaka is 19th from the top and 9 boys are ahead of her 
Therefore, Number of girls before alaka = 17-9-1=7. 
And number of girls after alaka = 20-alaka-7 
= 20-1-7 = 12

Asish leaves his house at 6.40 a.m. He reaches Kunal's house in 25 minutes i.e., at 7.05 a.m.
Both leave for office 15 minutes after 7.05 a.m. i.e., at 7.20 a.m.

Clearly, Ajay left home 10 minutes before 8.40 a.m. i.e., at 8.30 a.m. But it was 15 minutes earlier than usual. So, he usually left for the stop at 8.45 a.m.

Clearly, the last train left two and half hours before 18.00 hrs i.e., at 15.30 hrs. But this happened 40 minutes before the announcement made . So, the announcement made at 16.10 hrs.

Clearly, the last bell rang 45 minutes before 7.45 a.m. i.e., 7.00 a.m. But it happened five minutes before the priest gave the information to the devotee. So, the information was given at 7.05 a.m.

Anuj reached the place at 8.15 hours. Clearly, the man who was 40 minutes late would reach the place at 8.45 hours.  So, the scheduled time of the meeting was 8.05 hours.

Desk officer received the application on Friday. Clearly, the application was forwarded to the table of the senior clerk on Thursday. So, the application was received by the inward clerk on Wednesday.