Calculate the distance you will travel if you maintain an average speed of 9.0 km/h for one-half hour.

Question

mathmale · Answer

A commonly used formula from algebra and physics is d = rt.
This states that the distance traveled is the product of the rate (speed) (r) and the elapsed time (t).  You are given both the average speed and the length of time.  Calculate the distance traveled.

unofficialllyy · Answer

I did 9.0x.05 and got 4.5, and I tried 4.5 and I tried 5 and it said it was wrong

unofficialllyy · Answer

@mathmale

unofficialllyy · Answer

What would the unit of measurement be?

mathmale · Answer

average speed of 9.0 km/h  (units of meas. are km and hours)

"one half hour" is expressed symbolically as 0.5 hr, or$$\frac{ 1 }{ 2 }hr$$

mathmale · Answer

Try again, this time showing all of your work, and this time including the units of measurement while doing the actual calculations.

(9.0 km/hr)(0.5 hr) = ?      Which unit of measurement cancels here?

unofficialllyy · Answer

Oh I forgot to cancel out the hr. So It's be 4.5 km. Thank you.