The moon orbits Earth at 380,000 km distance. Light travels at 300,000 km/s. How long does light from the moon take to reach Earth?
Answer
1.27 seconds
How to solve it
1
Distance: 380,000 km
2
Speed: 300,000 km/s
3
Time: 380,000 ÷ 300,000 ≈ 1.27 seconds
Hints
Use time = distance ÷ speed