A man walks 10 km the travel a certain distance by train and then by bus as far as twice by the train. If the whole journey is of 70 km, How far did he travel by train?
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Let,
The distance travelled by train be T
The distance travelled by bus be B
Given,
The distance travelled by bus is twice as by the train
=> B = 2T
Therefore,
The total distance covered = by walk + by train + by bus = 70 km
=> 10 + T + B = 70
=> 10 + T + 2T = 70 (Since B = 2T)
=> 10 + 3T = 70
=> 3T = 60
=> T = 20
Therefore the distance covered by train = 20 km
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