There were 10 snowflakes at first. It snowed an additional 4 snowflakes every 5 minutes. How many minutes passed before there were 58 snowflakes? Think carefully first, then make a decision:
Without the first 10 snowflakes, there are 58 - 10 = 48 snowflakes needed. 48 / 4 = 12 5 - minute intervals are needed to get the additional snowflakes. 12 * 5 = 60 minutes passed. So, the answer is 60.