Firstly, apologies for the hard-to-see image. It's just for an outline of the problem.

The questions asks to find the value of x (on the right vertical side) to find the minimum time to travel to the top right corner of the "forest"

The bush can be travelled through at 3km/h and the "clear" area can be travelled through at 5km/h.

I started by equating the times of the 2 routes to take but came up with the wrong answer.

Any help is greatly appreciated.

The graphic shows 2 km at the bottom and x km on the right side.