What is the average speed (in km/h) of a boy who runs to the store 4 kilometers away in 30 minutes?

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What is the average speed (in km/h) of a boy who runs to the store 4 kilometers away in 30 minutes?

And what is the distance (in km) that he runs if he maintains this average speed for 1 hour? I need the answer, but I also need a very very easy to understand explanation for the answer. Thank you.

2007-08-30 13:38:39 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics

2 answers

8 km/h. 8km. For your first question speed = distance/ time. 4km x .5 hr = 8km/h. 2.) He is running 8km every hour. If he runs for one hour at the constant speed of 8km/h then he has run 8km.

2007-08-30 13:46:09 · answer #1 · answered by Anonymous · 0⤊ 0⤋

average speed = distance/time = 4 km/30 min = 4 km/0.5 hrs = 8 km/hr

d(t=1 hour) = 8 km/hr * 1 hr = 8 km

2007-08-30 20:42:21 · answer #2 · answered by nyphdinmd 7 · 1⤊ 0⤋