Pedestrian and cyclist

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

Correct answer:

t =  20 min

Step-by-step explanation:

4(t+(1·60+10))/60 = 18t/60

4·(t+(1·60+10))/60 = 18·t/60

14t = 280

t = 280/14 = 20

t = 20

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