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Two trains R and S are approaching each ...

Two trains `R` and `S` are approaching each other on a straight track, the former with a uniform velocity of `25m//s` and the latter with `15m//s`. When the are `225m` apart brakes are siultaneously applied to both of them. The deceleration given by te brakes to the train `S` increases linearly with time by `0.3m//s^(2)` every second (i.e. `dv//dt=-0.3t`), while the train `R` is given a uniform deceleration
What must be the minimum deceleration of train `R` so that the trains do not collide?

A

`5s`

B

`25s`

C

`15s`

D

`10s`

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The correct Answer is:
D
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