ten o'clock
Their adventures during that exciting period are related in `` The Radio Boys on Secret Service Duty . '' `` Very good , '' said Jack , bounding to his feet . `` Come on , let 's go . It 's ten o'clock now . If we hurry , we can cover the sixty miles to Mineola , put up the plane , and be in the city by noon . That will give us two or three hours there , and we can be home easily in time for dinner . '' `` All right , '' said Bob .