Otto and Joachim

Otto and Joachim go through the woods. After some time Otto tire and make 15 minutes stop. Joachim meanwhile continues at 5 km/h. Otto when he set off again, first running speed of 7 km/h, but it keep only 30 sec and 1 minute must continue at 3 km/h. This keeps cycling. How long Otto Joachim catch up?

Correct result:

t =  -1 min

Solution:

s1=515/60=1.25 km sJ=51.5/60=0.125 km sO=(70.5+31)/60=0.10833 km  0.10833 km<0.125 km sO<sJ=>t=inf min



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