I have keys but no locks. Read more
I have keys but no locks. 
I have a space but no room.
You can enter, but can’t go outside.
What am I ?
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I started 2 watches at the same ...Read more
I started 2 watches at the same time,
It turned out that one of them went two minutes per hour too slow,
and the other went one minute per hour too fast.
When I looked at them again,
the faster one was exactly one hour ahead of the other.
How long had the watches been running?
There are two farmers, and both have sheep. The first says ...Read more
There are two farmers, and both have sheep.
The first says to the second:
-If you give one sheep, we’ll have the same quantity of sheep.
And the second one says:
– No, if you give one sheep of yours, I’ll have the double of sheep than you.
How many sheep does each farmer has?
Read lessThere’s a bridge across the Rio Grande connecting Mexico and ...Read more
There’s a bridge across the Rio Grande connecting Mexico and the US. 
The Americans have a watchtower on the Mexican side. There is a guard who has strict orders to shoot anyone leaving Mexico and turn back anyone trying to enter Mexico without a pass.
The sentry comes out every 3 minutes with a rifle and a megaphone to check the bridge and carry out his orders.
It takes exactly 6 minutes to cross the bridge.
There is no check on the US side.
How does cunning Mrs Gonzales manage to go across to the US without getting shot ?