If eleven plus two equals one, what does nine plus five equal?

Can you count the number of blocks in the picture below?

Which five letter word can be added at the end of below word to form a
valid word?

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An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

It belongs to you, but other people use it more than you do. What is it?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

What does this rebus puzzle means ?

Decode below rebus
D
N
A
T
S , D

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

How can you take 2 from 5 and leave 4?