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Two cars "A" and "B" are approaching eac...

Two cars "A" and "B" are approaching each other head-on with speeds "20m/s" and "10m/s" respectively.When their separation is "X" then "A" and "B" start braking at `4m/s^(2)` and `2m/s^(2)` respectively. Minimum value of "X" to avoid collision is

(1) `60m`

(2) `75m`

(3) `80m`

(4) `90m`

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