Bunuel wrote:
How many miles long is the route from Nurich to Greensburg?
(1) Sam drove the first hour of the three-hour trip from Nurich to Greensburg at 5 miles per hour faster than he drove the final 2 hours.
(2) Sam drove the first 1/3 of the trip from Nurich to Greensburg at 38 miles per hour.
Let Distance N to G be D.
Stat 1: In the same distance, let speed be x
then first hour distance is - x+5*1
two hours distance is - 2x ( time * speed)
D = (x+5)1 + x(2)--> eq 1....not sure about x...Insufficient.
Stat 2: We know that D = ST.
Now T = T1 + T2
Now speed be x. given D/3 he covered at 38 miles per hour... T1= D/3*38 and remaining distance T2 = remainingdistance/ speed => 2D/3x
Now T = D/3*38 + 2D/3x---> eq 2... we don't have any info about T and x...Insufficient.
Both : Now total time from stat 1 is 3...then T = 3.
if we sub in eq 2...we get 3 = D/3*38 + 2D/3x.
Sub D from eq 1 in above question...entire equation will be in x... then we can get x value... x can sub in eq 1 to get D.
IMO C.