2. The speed of light in vacuum is c=3x10$^8$ m/sec, and is close to this in many media including air (almost the same), water and plastic. Using this speed, calculate the time (in seconds) needed for light to travel:
a. Across a 10 ft. room.
b. Across the country (3,000 miles)
c. Across an ocean (10,000 miles)
d. To the moon from earth (250,000 miles)
e. From the sun to earth (93 million miles) (Calculate this in minutes as well.)
f. To the nearest star (other than the sun) from earth (25,000,000,000,000 miles) (Calculate this in years as well.)