A train travelling from Jaipur to Agra meets with an accident after 1 hour. It…

A train travelling from Jaipur to Agra meets with an accident after 1 hour. It is stopped for 40 minutes, after which it proceeds at 5/8th of its usual speed, arriving at Agra 2 hr 24 min late. If the train had covered 80 km more before the accident, it would have been only 1 hr 48 min late. Find the usual speed of the train.