A radio wave travels 186000 miles per sec, how many kilometers will the wave travel in one microsecond if 1 mile=1.61 km.

A radio wave
travels 186000 miles per second. 1 mile is equivalent to 1.61 km. 186000 miles is equivalent to
186000*1.61 = 299460 km.

The radio wave travels 299460 km per second. It
travels 299460*10^-6 = 0.299460 km in one microsecond.

A radio
wave travels 0.299460 km in one microsecond.