The train went 4 h with a speed 60km/h, 2 h with a speed 70km/h and 3 h with a speed 65km/h. What distance did the train pass? Whether there will be able to pass this train the same distance ha of 7 h if moves with a speed 81km/h.

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Answer for the second question of a task: 81*7=567 will not be able 1)4*60=240 2)2*70=140 3)3*65=195 4)240+140+195=575
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Answer add