<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def minute_trend_times(start, end):
 """Expand a [start, end) interval for use in querying for minute trends NDS2 requires start and end times for minute trends to be a multiple of 60 (to exactly match the time of a minute-trend sample), so this function expands the given ``[start, end)`` interval to the nearest multiples. Parameters start : `int` GPS start time of query end : `int` GPS end time of query Returns ------- mstart : `int` ``start`` rounded down to nearest multiple of 60 mend : `int` ``end`` rounded up to nearest multiple of 60 """

    if start % 60:
        start = int(start) // 60 * 60
    if end % 60:
        end = int(end) // 60 * 60 + 60
    return int(start), int(end)