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Physics:-On a 120 km track, a train travels the first 30 km with a speed of 30 km/hr. How fast must the train travel the next 90 km so as to get average speed of 60 km/hr for the entire trip? |
| Answer» Physics:-On a 120 km track, a train travels the first 30 km with a speed of 30 km/hr. How fast must the train travel the next 90 km so as to get average speed of 60 km/hr for the entire trip? | |