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A train service was disrupted due to an accident after a travel of 30 km. The speed was reduced to three-fourths of the original speed. This caused a delay of 45 min. If the accident had happened 18 km farther, it would have been running late for 36 min. What was the original speed of the train?

A 50 km/h

B 30 km/h

C 60 km/h

D 40 km/h

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