Find Number of Meters

[nycmathguy]

The average speed of a car is 75 km/h. How many meters can the car travel in 20 minutes ?

A 25
B 250
C 2500
D 25000
E none of these

Let me see. I sense conversion factors is needed here.

D = rt

I know that 20 minutes is 1/3 of an hour.

Set up:

D = (1/3)(75)

D = 25 km.

How many meters in 25 km?

Using an online calculator, 25 km = 25,000 meters. So, the answer is choice D.

However, how do I convert 25 km to meters without a calculator?

 

[MathLover1]

multiply by 1000 because 1km=1000m

25 km to meters is 25000m

 

[nycmathguy]

multiply by 1000 because 1km=1000m

25 km to meters is 25000m

That's easy enough. Thanks.