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 70km/h. When will the freight train catch up?


t = 9:53 h Wrong answer

Step-by-step explanation:

(t-9)·40 = (t-(9+15/40))·70

1200t = 11850

t = 11850/1200 = 9.875

t = 79/8 = 9.875

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