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?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

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

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

What am I?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Different lights make me strange by changing me into different sizes. What am I?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?