Andy is two-fifths of ruth's age. if ruth is ten, how old is andy? type just the number in the box.

Andy is 4 years old.

Step-by-step explanation:

Given:

Ruth age = 10

We need to find Andy age.

Let the age of Andy be x.

Also given Andy is two-fifths of Ruth's age.

Expressing the above statement in expression form we get

Hence Andy is 4 years old.

  26 2/3

Step-by-step explanation:

Average speed is total distance divided by total time.

The time for the first trip was ...

  (90 mi)/(20 mi/h) = 4.5 h

The time for the return trip was ...

  (90 mi)/(40 mi/h) = 2.25 h

Then the average for the trip and return is ...

  total miles/total time = (90 +90)/(4.5 +2.25) = 26 2/3 . . . . mi/h

The average speed for the round trip was 26 2/3 miles per hour.