According to the question:Time taken to cover the distance = 2.00 ns= 2.00 x 10-9 sSpeed of light = 3.0 x 108 ms-1Distance travelled by light in 2.00 ns= Speed of light x Time taken = (3.0 x 108 ms-1)(2.00 x 10-9 s)= 6.00 x 10-1 m= 0.600 m