Speed of light = 3.0x10^10

Wavelength = 2.5 cm

a) How long would it take for one wavelength of the wave to travel past the point X? In other words, how many seconds would it take for this wave moving at this speed to travel 2.5 cm to the right?

b) How many wavelengths would travel past the point X during a time interval of one second(use the speed this wave travels and its wavelength to calculate number of waves per second)