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A car starts moving on a straight road. It makes the entire journey in three parts. The total time of journey is 25 s. For first part it accelerates at a constant rate `5m//s^(2)`. For second part it moves with a constant speed. For the third part it retards at constant rate `5m//s^(2)` to come to rest.
If the average speed for entire journey is 20 m/s, time period of first part of journey is

A

5 s

B

20 s

C

15 s

D

10 s

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The correct Answer is:
A
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