Young Cyclists

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

Correct answer:

t =  0.5 h

Step-by-step explanation:

15(t+20/60) = 25t

15·(t+20/60) = 25·t

600t = 300

t = 300/600 = 0.5

t = 1/2 = 0.5

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