Solution:

You are the ship captain. Read the first sentence again. Therefore, the color is same as your eyes color.

Solution:

295 minutes.

Explanation
When he cut 59 stocks, the 60th stock will remain.
59 * 5 = 295 minutes.

Solution:

Explanation:

Since Rohini is 21st from either side, there must be 20 people in front of her and 20 people behind her.
20 + 20 + 1 (she herself) = 41
Therefore, the queue consists of 41 people.

Solution:

No stairs, Its a one story building.

Solution:

If you read the question carefully, you will find that both times are same.
An hour and a half are equal to 90 minutes only.

Solution:

You should choose the second shop.

It's a common logic. In the first shop, the barber had neat hairs. Since there are only two barbers in the entire town, he must have got his hairs cut from the barber in the second shop.

Solution:

The police officer knows the story was not true since Vasco was shot from back and he was injured only in the stomach.

Solution:

McLaughlin

Solution:

Peter will have to use a lock box that can hold two locks. He will put the ring in a box and will mail it to Mary. Upon receiving the box, Mary will put her own lock box inside and will send back to Peter. Peter can then-then take off his lock and send it off to Mary again.

Solution:

The color of the hat which the man A is wearing is the white color hat.
It is clear with the question and the clue itself that neither B nor C has information regarding this and therefore they do not answer. For the explanation, let's start from C. the man C can see man A's hat and also man B's hat. He must be seeing at least one white hat on any one of them. If he sees two black hats, then he clearly knows that he is wearing a white colored hat. But the man B cannot give an answer. He might see a white hat on man A. if the man B saw a black hat on A, he would know that he is wearing a white one. The question itself says that the man A answers to the question and therefore, the man A shouts that he is wearing a white one.