Two trains

From station A, the freight train traveled at a speed of 40 km/h in 9h. When he drove 15km, the fast train started from station A in the same direction at a speed of 70km/h. When will it the freight train catch up?

Result

t = 9:53 h Wrong answer

Solution:


(t-9)•40 = (t-(9+15/40))•70

1200t = 11850

t = 79/8 = 9.875

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