Monday noon
Mr. Temple paused for breath , and Frank , who had been computing mentally , interrupted . `` Our plane could do it all right , '' he said . `` That is , if -- When did this happen ? '' `` Monday noon or a little later , '' said Mr. Temple . `` Well , they stole it sometime Saturday night , '' said Frank . `` Yes , they would n't have had to make more than eighty miles an hour steady flying to do it . But where did they get the petrol ? ''