Otto and Joachim

Otto and Joachim go through the woods. After some time, Otto becomes tired and makes 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. He keeps cycling. How long did Otto Joachim catch up?

Correct answer:

t =  -1 min

Step-by-step explanation:




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