Question

The 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 a delay of 45 min. If the accident had happened 20 km farther, it would have been running late for 36 min. What was the original speed of the train?

A 40 km/h
B 60 km/h
C 48.5km/h
D 33.3 km/h
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