Answer:
16km/h
Explanation:
Vt=20km/h ---train speed
Vd=4km/h
Donas speed relative to ground is:
Vrd=Vt-Vd
Donas is moving in opposite direction of train .
Vrd=20km/h-4km/h
Vrd=16km/h
Spectrum can can different meaning depending on the specific situation. But overall, a spectrum is a large amount of or infinite collection of values that exist withing a certain range. For example, light wavelengths exist on a spectrum becuase there are an infinite number of different wavelengths.
Hope this helps.<span />
Lunar<span> eclipses are governed by the same principle as solar eclipses: In this case however, the </span>Earth<span> 'slides itself' between the </span>Moon and the Sun<span>.</span>