Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

How can you tell a raw egg from a hard-boiled egg?

If 1+9+8=1, what is 2+8+9?

You can hear me, but you can't touch or see me.

What am I?

If you say my name, I will no longer exist. What am I?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

What is more useful when it is broken?

They are three errirs in this question. Can you find them?