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Distance, Time & Rate

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by stop@800 » Fri Sep 26, 2008 7:43 am
IMO E

at end we have two unknowns and just one equation.
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by 4meonly » Fri Sep 26, 2008 8:29 am
Can somebody make it variables with algebraic approach?
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by pre-gmat » Fri Sep 26, 2008 8:47 am
The first option does not tell you anything besides that AL drove 1 hr longer but 5mph less than Pablo. There are 2 unknowns.

The 2nd option tells you only about M driving 450 miles.

Together still the 2 unknowns are not solved.

E should be the answer.

Wat's the OA?
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by stop@800 » Fri Sep 26, 2008 12:43 pm
4meonly wrote:Can somebody make it variables with algebraic approach?
Total 1500 miles
3 ppl A, P and M

A:
No infor for M so not sufficient


B:
no info for A and P so not sufficient


A+B
from B
M: 9 hr and 60 miles avg so total 450 miles
soo total 1050 miles left and two ppl A and P

Time by P = t (let)
Time by A = t+1

avg speed P = x (let)
avg speed A = x-5

now
dis = speed * time

1050 = tx + (t+1)(x-5)
Two unknowns and single equation


Hope it helps.
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