Why Wine Glass Stem is so long?

Why 1729 is a magic number? Answer Logically.

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?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Forwards I am heavy, backward I am not. What am I?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?