I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What Time Should the last watch show in the below figure?

What four weights can be used to balance from 1 to 30 pounds?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

What does this rebus mean?

O
N
C
E
TIME

By using 'because' continuously three times, can you make an English statement ?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?