I can't find the answer for the second part

Question

If the earth to moon distance is 229700 miles, what is this in kilometers?

what I come up with is 369666.3 which is true but the second part is complicating 

b) based on this distance, how many seconds would it take for moon light to tra from the moon to earth? The speed of light is 2.998x10^8m/s. 

 

Answer 1

1 mi = 1.6094 km

229700 mi = 369679.18 km

 

369679.18 km = 369679180 m

 

3.6967918 x 10⁸ / 2.998 x 10⁸ m/s

1.23308599 sec

Answer 2

Hello Zeze,

 

(a) First the relationship between mile and kilometer is needed (look inside the cover of your textbook)

 

1 mile = 1.60934 km

 

Distance in km = 229700 miles * 1.60934 km/1 mile

  

                       = 369665 km

 

(b) 1 km = 1000 m

 

Distance in meters = 369665 km* 1000 m/ km

                            = 369665000 m

 

time for light to travel from the moon to earth = distance from earth to moon/speed of light

 

                                                                      = 369665000/2.998x10⁸

 

                                                                      = 1.233 secs

 

                                       

Answer 3

Hello, If you take your answer 369666.3km and convert that in meters, you'll end up with approximately 3.69x10^8m 

 

now, take 3.69X10^8m which is your distance and divide that by the speed of light (2.998x10^8m/s) and your units will cancel out

 

so you should end up with about 1.2 seconds. 

 

Hope that helps