A race with three cars

Algebra Level 2

Three cars A, B and C standing at the same starting line. A start the first with 30km/h. Two minutes later, B start going with 40km/h. Three minutes after B started, C also start with a speed of 60km/h. When B catch A at a point, A increase the speed by 15km/h.

When C catch A at a point, how many kilometers will be it far from the starting point?

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