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The speed of a car during the second hou...

The speed of a car during the second hour of its journey is thrice that in the first hour. Also its third hours speed is the average speed of the first two hours. Had the car travelled at the second hours speed during all the first three hours then it would have travelled 150 km more. find the percentage reduction in time in the second case for the first three hours :

A

`33(1)/3%`

B

`40%`

C

`25%`

D

`50%`

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The correct Answer is:
A
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