J.P. Morgan Sales&Trading Summer Analyst interview questions

Tell me about a time you dealt with a difficult person.

General competencies e.g. when have you shown leadership skills, what is your greatest achievement etc. Then, how many tennis balls can fit in this room? How much water flows past canary wharf in an hour? If a companies stock price falls if I land a head on a coin, what is the probability that a rival company's stock price falls? 10x10 cube has outside covered in red paint. How many cubes have one side that is red?