DJS1147 DJS1147

05-10-2016
Mathematics

contestada

Sarabi drove 20 mi at 40 mph. How long did she drive?
Let d represent distance, r represent rate, and t represent time.

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apologiabiology apologiabiology

05-10-2016

1/2 of the time

d=st
distance=speed times time
we want to find time
divide both sides by speed
d/s=t

d=20
s=40
20/40=t
1/2=t
this is in hours

she drove for 1/2 hour or 30 mins

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