A convex, rearview mirror of focal lengt...

A convex, rearview mirror of focal length 20cm, is fitted in a car. A second car 2 m broad and 1.6m high is 6m away from the first car and overtakes the first car at a relative speed of `15 ms^(-1)`, then the speed of the first car is

`0.016 ms^(-1)`

`0.257 ms^(-1)`

`0.162 ms^(-1)`

`0.0073 ms^(-1)`

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