A car travels at an average speed of 50 km/h. What distance will it travel in 3 hours?

Question

i need help on this problem its very difficult to me. i would need help in this one too :A car travels at an average speed of 50 km/h. What distance will it travel in 30 minutes?

Answer 1

Hi there, Jose!

 

So, you were given an average speed for the car of 50km/hr and a time of 3 hours. One way you can do this is to look at it in fractions, with x being the distance you are looking for.

 

50 km = x km

1 hr        3 hrs

 

From there, you cross-multiply and solve for x.

 

(50 km)*(3 hrs) = (x km)*(1 hr)

 

x km = (50)*(3)/(1) = 150km

 

Now, your other question can be answered the exact same way. 30 minutes is the same as 1/2 of an hour, so just put 0.5hrs in where the 3hrs was in the previous problem. So to show you how it works once more, here are your calculations:

 

50 km = x km
1 hr        0.5 hrs

(50 km)*(0.5 hrs) = (x km)*(1 hr)

x km = (50)*(0.5)/(1) = 25km

 

I hope that helps!

Answer 2

Hi Jose;

Distance=(rate)(time)

Distance=(50 km/hour)(0.50 hours)

Please note, we are not using minutes as a unit, even though that is what you provided in your secondary request.  All units must align, and km/hour aligns with hour.

Let's cancel units where appropriate...

We have hour as a denominator (divisor) and numerator...

Distance=(50 km/hour)(0.50 hours)

Distance =(50 km)(0.50)

Please note, cancellation of units must occur before calculations.  If your units do not align, you have the wrong equation...

Distance=25 km

 

In three hours...

Distance=(50 km/hour)(3 hours)

Distance=150 km