The Smart Sardar

A sardar and a lawyer were seated next to each other on a long flight.
To pass the time, the lawyer suggested that they try to stump one
another with trivia.
"If I ask you something that you don't know, you owe me Rs 5. The
same goes if you ask me something I don't know." The sardar
refused.

"Okay. If you don't know an answer, you pay me Rs 5, but if I don’t
know an answer, I pay you Rs 50."
The sardar accepted. The Lawyer went first.

"What is the distance from the earth to the moon?"

The sardar didn't say anything, but merely reached into her purse,
pulled out a Rs 5 bill and handed it to the lawyer. Then it was her
turn.

"What has four legs going up a hill, but only three coming down?"

The lawyer had no idea, so he gave her a Rs 50 bill.

"So, what is it?"

The sardar said nothing, but merely reached into her purse and
gave a Rs 5 bill to the lawyer.