A radar sends an electromagnetic signal ...

A radar sends an electromagnetic signal of electric field `(E_0)` = 2.25 V/m and magnetic field `(B_0) = 1.5 xx 10^(-8)T` which strikes a target on line of sight at a distance of 3 km in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time t=0 from radar, then after how much time echo will reach to the radar?

`2.0xx10^(-5)s`

`4.0xx10^(-5)s`

`1.0xx10^(-5)s`

`8.0xx10^(-5)s`

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