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Al(A), Pablo(P), Marsha(M)
Distance(D) = Speed(S)* Time(T)
STEM 1:
TA = TP + 1, A could have driven lesser distance if P was much faster than A, and we know nothing about M
SA = SP - 5, A could have driven significantly more time than P, and we know nothing about M
Hence STEM1 by itself is inconclusive
STEM 2:
TM = 9, SM = 50 --> DM = 450 --> So DA + DP = 1050
Clearly A or P should drive more distance than M, but dodnot know the relation between distances driven by A and P. Hence STEM2 by itself is inadequate.
Combining STEM1 and STEM2
DA = (TP + 1) * (SP - 5) = DP + SP - 5*TP - 5
We donot know if SP - 5*TP - 5 is positive or negative to know, which of DA or DB is greater?
Another possible equation is DA + DP = 1050 --> 2*DP + SP - 5*TP - 5 = 1050. This still doesnot anser the above question.
Hence answer is E.
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