ten o'clock
`` Maybe we can even get up an intercollegiate aeroplaning contest , '' remarked Sam . `` I 'm afraid it 's a little too early for that yet , '' answered Dick . `` But such contests may come one of these days . '' The Rover boys were tired out from their day of labor and excitement and ten o'clock found them in their rooms ready to go to bed . Tom and Sam had started to take off their shoes when there came a faint tap on the door and Bob Grimes appeared . `` Hello , Bob ! '' cried Tom .