In a boat race between David and Jeff, when Jeff had covered half the

Question

In a boat race between David and Jeff, when Jeff had covered half the 30-mile race distance, David was 2 miles ahead of Jeff. How long did it take David to travel the entire 30-mile distance?

(1) David traveled the last 15 miles of the race’s distance in 40 minutes.

(2) Jeff traveled the first 15 miles of the race’s distance in 45 minutes.

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Pankaj0901 · Answer

Answer: C

S1: not sufficient, the first 17 miles speed or time taken by David is not known.

S2: not sufficient, the last 13 miles speed or time taken by David is not known.

S1+S2: We know the time it took for David to complete the entire 30 miles: 40 mins + 45 mins = 85 mins. ANS C

IVYsaurBRIDGE · Answer

Is it C since we weren't given that each was traveling at a constant speed?

LamboWalker · Answer

(1) - Insufficient. We don't know David's speed in the first 15 miles.

(2) - Insufficient. This does give us John's speed for the first 15 miles aka David's speed for the first 17 miles, but no info on the last 13 miles.

(1) and (2) - Insufficient.

We now know David's speed for the first 17 miles and last 15 miles, but without any info on what his speed was in the 2 mile stretch from start of 16th mile to end of 17th mile, we will not be able to determine his overall average speed.

Thus, answer is E.

SatvikVedala · Answer

Hi  IVYsaurBRIDGE

The answer is E

On combining statements 1 & 2

we have that David covered 17 miles in 45 minutes (from Statement B & Question)

Also, from Statement A we have 15 miles covered in 40 minutes

So there is an overlap, otherwise he would have covered 32 miles (but the disatance is 30 miles)

Total time taken must be = 45+40 - common part (which cannot be just limited since he might have taken more time for those 2 miles & lesser time for rest 13)

So the answer is E

In a boat race between David and Jeff, when Jeff had covered half the

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GMAT Data Sufficiency (DS) Questions

In a boat race between David and Jeff, when Jeff had covered half the

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