P. 4064. Hansel and Gretel live in Gingerbread street 21. Once Gretel visited Little Red Riding Hood, she left home at 10 past 8. Gretel was walking at a constant speed of 3 km/h. Hansel noticed that Gretel left Little Red Riding Hood's present at home, so at 20 past 8 he also left home and ran after Gretel at a speed of 5 km/h to give her the present. He was lucky and reached Gretel before she got to Little Red Riding Hood's house. At least how far does Little Red Riding Hood live from Gingerbread street 21?
Deadline expired on 13 May 2008.