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

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

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

Which tank will fill first?

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

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

You can see three almost identical images below. Can you spot the odd one out from them?

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

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211