The constructor creates a new Clock with the given hour and minute. Your constructor must ensure that, no matter what numbers are given, the hour is from 0 to 23 and the minute from 0 to 59. Thus, if someone tries this:

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?