Pedestrian and cyclist

Pedestrian out with a speed of 4 km/hour from city center and after 1hour and 10 minutes came after him cyclist at speed of 18 km/h. At how many minutes he catches up with pedestrian?

Correct result:

t =  20 min

Solution:

4(t+(1•60+10))/60 = 18t/60

4•(t+(1•60+10))/60 = 18•t/60

14t = 280

t = 20

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