Question

A rocket moves at the speed of 4.9 miles per second. How fast is the rocket traveling kilometers/hour (km/h)? (1 mile = 1.6 kilometer)
A.) 0.0008 km/h
B.) 0.0022 km/h
C.) 11,025 km/h
D.) 28,224 km/h

Answer 1

The answer is c) 11,025 km/h

Answer 2

First, we convert the seconds to hours

1 hour = 60 minutes = 60 * 60 seconds = 3,600 seconds

1 hour has 3,600 seconds

If the rocket moves 4.9 miles in a second, in 3,600 seconds , it moves = 3,600*4.9 = 17,640 miles

So, in 1 hour the rocket moves 17,640 miles.

We have been given that 1 mile = 1.6 kilometers

So, 17,640 miles = 17,640*1.6 = 28,224 kilometers

So the rocket moves at a speed of 28,224 kilometers/hour