daavionne5116 daavionne5116

23-01-2024
Physics

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A train goes from ballugunge to sealdah at an average speed of 20 km/hr and comes back at an average speed of 30 km/hr. the average speed of the train for the whole journey is
a) 15 km/hr
b) 18 km/hr
c) 24 km/hr
d) 30 km/hr

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