Question

Distance travelled by light in 6 months.

Answer 1

distance travelled in 1 year = 1 ly = 9.461 × 1015m
distance travelled in 6 month(½ year) = ½ly = (9.461 × 1015)/2 = 4.7305 × 1015m

Answer 2

Speed=Distance/ Time

Distance=Speed × Time

Here we need to find the distance,
We know,

Speed of light=3×10⁸ m/s

Time we need in seconds,
Since we are given time in months,we need to convert it into seconds.

6 months= 6×30 = 180 days (assuming every month has 30 days [avg])

converting 180 days to seconds= 180 days × 24 hrs × 60 min × 60 sec =15552000 sec 

Now use the formula:
Distance= Speed × Time
               =3×10⁸ m/s × 15552000 s
               =4.6656 ×10¹⁵ m