please I have 30 min to solve it

Question 1: (50 pts] a) Write a Java method that takes two integers as parameters (m and n) and returns the product of all integers between 1 and m witch are multiple of n. b) Write a test program (main) that asks the user to enter two integers m and n and displays the product of all integers between 1 and m witch are multiple of n. Sample Run: Enter two integer: 15 3 The integers between 1 and 15 witch are multiple of 3: 3 6 9 12 Their sum is 30