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?

What makes this number unique: 8,549,176,320?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you identify the hidden rebus in the image below?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

How many Watermelons are there in the below picture?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?