static int lagDuration ( int h1 , int m1 , int h2 , int m2 , int k ) {
  int lag , t1 , t2 ;
  t1 = ( h1 + k ) * 60 + m1 ;
  t2 = h2 * 60 + m2 ;
  lag = t1 - t2 ;
  return lag ;
}

static int lagDuration ( int h1 , int m1 , int h2 , int m2 , int k ) { int lag , t1 , t2 ; t1 = ( h1 + k ) * 60 + m1 ; t2 = h2 * 60 + m2 ; lag = t1 - t2 ; return lag ; }
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