Given,

The young lady covers a distance of 6 km at a speed x km/hr.

Along these lines, the time taken to cover initial 6 km

[Since, Time = Distance/Speed]

Likewise given, the young lady covers the leftover 6 km distance at a speed

Along these lines, the time taken to cover next 6 km

What’s more, the complete time taken to cover the entire distance

Then, at that point, the beneath condition can be framed,

Along these lines,

As speed can’t be negative.

is just substantial

Subsequently, the worth of