What has 13 hearts but no other organs?

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

What kind of band never plays music?

I am quite hot but become too cold if you remove the first two letters. What am I?

You need to move three matchsticks to form three squares. Can you do it?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Prove that the below maths equation is true.

8 + 8 = 91

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

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