Young Cyclists

Charlie and Peter will attend the Young Cyclists Meeting today. Peter is still not able to start, so Charlie went first alone. Peter followed him in 20 minutes. How long does he take to reach Charlie? Charlie is traveling at an average speed of 15km/h, Peter's riding speed is 25km/h.

Correct result:

t =  0.5 h

Solution:

15(t+20/60) = 25t

15•(t+20/60) = 25•t

600t = 300

t = 1/2 = 0.5

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