Arthur D. answered 09/24/15
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d=r*t
1 mile at the rate of 30 mph
1=30*t
t=1/30 of an hour
total distance=rate*total time
2=60*total time
2/60=total time
1/30 of an hour= total time
1/30 of an hour is 2 minutes
you need 2 minutes to go 2 miles, the first mile at 30 mph and the second mile at X mph for an average of 60 mph
you already used up all your time going 30 mph for 1 mile
you have no time left
this is an impossible situation