On an 80 km track, a train covers the first 50 km with a speed of 50 km/h. With what velocity should it cover the next 30 km so that its average speed is 60 km/h? a 60 km/h b) 80 km/h c) 90 km/h d) 100 km/h.
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the velocity should it cover the next 30km is 80km
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