Question

A train service was disrupted due to an accident after a travel of 30 km. The speed was reduced to four-fifths of the original speed. This caused it 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 30 km/h
B 60 km/h
C 50 km/h
D 40 km/h
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