A man walks 10 km, then travels a certain distance by train and then by bus as far as twice by the train. If the whole journey is of 70km, how far did he travel by train?
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man walks 10 km = 70 - 10 = 60
then he travelled 20 km in train and the twice of 20 is 40
then he travelled 20 km in train and the twice of 20 is 40
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