What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

What shoe company does this rebus represent?

I look at you, you look at me I raise my right, you raise your left. What am I?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

Why 1729 is a magic number? Answer Logically.

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?