Question 1144452
mr. and mrs. austria love to run around the town. from past experiences, they know that mr. austria can run 6 km in the time it takes mrs. austria to run 4km. they have decided that they need to run the same distance, 9 km, and finish together. how much of a head start does mrs. austria need them to finish together? 
---------------
It's the same distance if they start together and the faster person runs 9 km.
Mr. takes 1.5 hours.
Mrs. runs 6 km in 1.5 hours
------> 3 kms