Compute each part of given problem:

Problem: One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching the first one, a second snowball is thrown at a low angle timed to arrive before or at the same time as the first one. Assume both snowballs are thrown with a speed of 15.0 m/s. The first one is thrown at an angle of 60.0° with respect to the horizontal.

Part A: At what angle should the second (low angle) snowball be thrown to arrive at the same point as the first?

Part B: How many seconds later should the second snowball be thrown after the first to arrive at the same time?

Please give actual answer for above problem.