Railway Announcement

Algebra Level pending

In an announcement on a railway station, a passenger hears that the last train has passed the station 30 minutes earlier than his train. On the next station that is 20 km away from the previous station, in the other announcement he hears that the first train arrives 20mins earlier than his train. Reading from his watch, he calculates average speed of the train viz. 60 km/hr. Determine the average speed of the first train.

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