The speed of the train in going from raipur to varanasi is 100 km/hr while when coming back from varanasi to raipur its speed is 150 km/hr find the average speed of whole journey
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Answer:
120
Step-by-step explanation:
avg. speed = total distance /total time
= d+d
------------------------
(d/100)+(d/150)
= 2
------------------------
(2+3)/300
= 2*300/5
= 120 kmph
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