Morgan Stanley Information Technology Analyst interview questions

The aptitude test was held on hackerrank. It consisted of 19 MCQs and 2 coding questions. First coding question was easy, they had given time as a string ("HH:MM") in 24-hour format and seconds as integers. We had to return time after given number of seconds in same format. The second coding question required us to find all substrings of a string containing each vowel atleast once.