If you bike for 3 hours at 10 mph and then walk for 1 hour at 2 mph, what would be your average speed?

Question

what is the average speed i don't understand

Answer 1

The average speed is essentially how much progress you made over a period of time, counting all the various changes of pace.

Lets parse out the bike ride:

3 hours at 10 miles per hour means you've traveled 30 miles

Now for the walk:

1 hour at 2 miles an hour means you walked 2 miles.

 

Adding the miles up gives us 32 miles traveled.

Adding the hours up gives us 4 hours of travelling.

 

That means we have ^{32 miles}/_{4 hours}. Complete that problem and you have your average mph.