Humpty Dumpty sat on a wall, admiring his new digital watch which displayed hours and minutes only. He noticed that it was
when Jack and Jill set up the hill, but that when they later came tumbling down again his watch showed only
. At that point Humpty realised that he’d had his watch on upside down all the time! How long did Jack and Jill take to go up the hill and down again?
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Junior Mathematical Challenge 1997 (1997)
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