Can someone help me solve this question from the aero course ATPL workbook 6th edition?
Genghis (as always) has hit the nail on the head. You don't have enough information. But, having used Aerostudies myself, you seem to have left out a lot of the information that is provided in the book to help you answer the question. A similarly worded question in the 4th edition provides the cruise altitude and temperature in addition to the wind.