import time


def elapsed_time(start):
    """Compute time since provided start time.

    Parameters
    ----------
    start: float
        Output of time.time().
    Returns
    -------
    Elapsed hours, minutes and seconds (as tuple of int).
    """
    time_elapsed = time.time() - start
    hrs = time_elapsed // 3600
    secs = time_elapsed % 3600
    mins = secs // 60
    secs = secs % 60

    return int(hrs), int(mins), int(secs)