2.998x10^8 m/s is how many kilometers per hour

What is being asked here is to convert the given speed into values with different units. To do this, we need conversion factors for the units given and asked.

2.998x10^8 m/s (1km / 1000m) (60s / 1 min) (60 min / 1 hr) = 1.0793 x 10^9 km/hr