1. Rates, and minutes

Jon is given some money by his mother to pick up some milk at a local store. He walks slowly to the store at a rate of 3 km/h for 15 minutes, takes 5 minutes to buy the milk, and then runs home at a rate of 5 km/h. Create a graph to present this information and use the graph to determine how long the whole trip took.

I just need help solving the bolded part. What formula am I supposed to use to figure how long he made it back home at 5 km/h?

Rise
____ ?
Run

2. Originally Posted by Ivory
Jon is given some money by his mother to pick up some milk at a local store. He walks slowly to the store at a rate of 3 km/h for 15 minutes, takes 5 minutes to buy the milk, and then runs home at a rate of 5 km/h. Create a graph to present this information and use the graph to determine how long the whole trip took.

I just need help solving the bolded part. What formula am I supposed to use to figure how long he made it back home at 5 km/h?

Rise
____ ?
Run
Hi

"He walks slowly to the store at a rate of 3 km/h for 15 minutes" => this means that the distance between his home and the store is 3km/h x 1/4h = 0,750 km

"runs home at a rate of 5 km/h
" => this means that he ran back home in 0,750km / 5km/h = 0.15 h = 9 minutes