Question

I need some help with this question here
Roshni cycles 2 km at y km/h and then runs 4 km at (y-4) km/h.
The whole journey takes 40 minutes.
i) Write an equation in y and show that it simplifies to $y^{2} -13y+12=0$
Please answer as soon as possible. Many thanks in advance!

Answer 1

Answer:

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