calculate the average speed (in km/hr) of Charlie who runs to the store 4 km away in 30 mins

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03-05-2016
Physics

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calculate the average speed (in km/hr) of Charlie who runs to the store 4 km away in 30 mins

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AL2006 AL2006 · Answer 1 · 2016-05-03T00:17:46+02:00

First of all . . .

-- You want to know "km / hr", so you know you'll have to divide distance by time.

-- You want "km / hr", so you know the time will have to be in hours.

   30 minutes = 1/2 hour

-- Doo da division:

(4 km) / (1/2 hour)

   = (4 over 1/2) (km/hr)

   = (4 times 2/1) (km/hr)

   = 8 km/hr .