Rate time and distance problem. Please answer!

Question

Dave and Daniel leave their houses at 9:30 am walking towards each other. they meet at 10:00am. if their houses are 8 km apart, and Dave is walking at 9 km/h, find Daniel's rate

Answer 1

Since Dave walkes at 9 km/h and walked for 1/2 h he walked 4 1/2 km.  

 

Dan then must've walked 8km - 4 1/2 km or 3 1/2 km in 1/2 hr.

 

Using the formula Distance = Rate * Time  where Dan's Distance is 3 1/2 km, and Dan's Time is 1/2hr, we can solve for his Rate.

 

Distance = Rate * Time

 

3 1/2km = x * 1/2h      In this equation multiply both sides by 2 or dividing both sides by 1/2

 

2*(3 1/2km) = (x * 1/2)*2,    X = 7 km/h