Question

Light waves travels with a speed of 3 into 10 raise power 8 metre per second Express the speed in kilometres per hour

Answer 1

To convert m/s to km/h simply multiply by 18/5

30000000×18/5
108,000,000 km/h

Answer 2

3*10^8*18/5
300000000*18/5
60000000*18
1080000000km h^-1