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Time taken by Helen to reach her house =?

Statement I

Helen's average speed = 72 mph

We dont know anything about the distance .

Insufficient

Statement II

If the avg. speed is 8 more the time taken is 1 hr less

We dont know anything about the distance

Insufficient.

Combining I & II

72*t = d

(72+9)*(t-1) = d, I am taking 9, greater than 8

81*(t-1) = 72*t

81t - 81 = 72t

9t = 81

t=9

Hence Sufficient.

Hence C.

Whats the OA?

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I agree with C

But I think that (72+9)*(t-1) = d

Should be (72+8)*(t-1) = d
solving 72t=80(t-1)
t=10

Why you decided to add 9?
Question states the "if the speed was 8 kmph greater"

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