Bob and Bobek

At 10h 20min runs Bobek from hat at average speed 12 km/h. At what time must run out Bob at speed 18 km/h to catch him 9 kilometers from the hat?


h = 10:35 Wrong answer




720t = 7980
18h-18t = -9

h = 12712 ≈ 10.583333
t = 13312 ≈ 11.083333

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