train moves with a speed of 30 km per hour in the first 15 minutes and then the speed of 60 km per hour in the last in 30 minutes calculate the average speed of the train for this journey
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Answer:
120km/hr
Explanation:
given
total distance = 30+60= 90 km
total time = 30+15 = 45 min = 0.75 hr
average speed = Total distance / total time
average speed = 90/0.75
average speed = 120
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