Decode this picture on T-Shirt and tell what it says ?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

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.

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

What has 88 keys?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

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?