the train covers a distance of 480 km at a uniform speed if the speed has been 8 kilometre less than it would have taken 3 hours more to cover the same distance find the original speed of the train. why has this question been deleted by Cbse for year 2020-21
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bhai please mujhe khilao and unnati 466
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Answer:
The original speed of the train is 40 km/hour
Step-by-step explanation:
Let the original speed of the train be x km/hour
Distance traveled by the train = 480 km
Time taken by train =
x
480
If the train would have taken 3 hours more then time =
x−8
480
⟹
x
480
=
x−8
480
+3
⟹
x
480
−
x−8
480
=3
⟹3x
2
−24x+3840=0
⟹x
2
−8x+1280=0
⟹ x = -32 or x = 40
But speed can not be negative ⟹x=40
Hence, the original speed of the train is 40 km/hour
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