Which is an expression to find the speed in m/s?

d = 40 meters, t = 10 seconds

A. 40/10

B. 40x10

C. 10/40

D. 40+10

Question

Which is an expression to find the speed in m/s?
 
d = 40 meters, t = 10 seconds
 
 A. 40/10
 
 
 B. 40x10
 
 
 C. 10/40
 
 
 D. 40+10

anonymous · Answer

Did a quick research and found this: http://www.wikihow.com/Calculate-Speed-in-Metres-per-Second What I understood is that V=D/T. Which means A is the right answer

mrnood · Answer

"per" means "divided by"

so 
metres PER second means mtres divided by seconds

anonymous · Answer

dividing 40 by 10 or 10 by 40

anonymous · Answer

40/10

mrnood · Answer

like I said

so which number is metres?
which is seconds?

metres divide by seconds

anonymous · Answer

What about this one 

What is the value of time, t, for the given values of distance, d, and rate, r? 

d = 315 mi, r = 45 mi/h
 
 A.
7 h
 
 B.
7 mi
 
 C.
14,175 h
 
 D.
14,175 mi

anonymous · Answer

The formula for this would be Time = distance ÷ rate(speed). So you need to fill in the speed in meters per second and the time in seconds. You will now have your answer in seconds.

mrnood · Answer

look at the units:

you want to find 'time' (or hours)

hours = miles / (miles per hour)

anonymous · Answer

I am still not getting it what dose mi/h mean

anonymous · Answer

Miles per hour

anonymous · Answer

minutes or hours

anonymous · Answer

what?

anonymous · Answer

mi/h means miles per hour

anonymous · Answer

ok so that means that I need to do 315/45

anonymous · Answer

Yes

anonymous · Answer

sure