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9th Class Science Time and Motion Question Bank 9th CBSE Science Motion

  • question_answer
                    On a 100 km track, a train travels the first 30 km at a uniform speed of 30 km/h. How fast must the train travel the next 70 km, so as to average 40 km/h for the entire trip?

    Answer:

                                                    Total distance, s = 100 km Total time,    Now (average speed)                                                         (Speed for next 70 km) (2)


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