A runner ran of a 5 kilometer race in 21 minutes. They ran the entire race at a constant speed. How long did it take to run the entire race?
How many minutes did it take to run 1 kilometer? ​

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

The sides of a parallelogram are 24cm and 16cm. the distance between the 24cm sides is 8 cm. find the distance between the 16cm sides

What expression is equivalent to (84+16)