Steve traveled the first 2 hours of his journey at 40 mph an

Question

Steve traveled the first 2 hours of his journey at 40 mph and the remaining 3 hours of his journey at 80 mph. What is his average speed for the entire journey?

A. 60 mph
B. 56.67 mph
C. 53.33 mph
D. 64 mph
E. 66.67 mph

zerotoinfinite2006 · Answer

Distance traveled in 2 hours = 2 * 40 = 80 m
Distance traveled in 3 hours = 3 * 80 = 240m

Total distance covered = 240 + 80 = 320m
Total time = 2 + 3 =5 h

Hence avg speed = total distance covered / total time taken

= 320/5 = 64mph

Answer: D

Bunuel · Answer

average \ speed=\frac{total \ distance}{total \ time} ;

total \ distance=2*40+3*8=320 ;

total \ time=2+3=5 ;

average \ speed=\frac{total \ distance}{total \ time}=\frac{320}{5}=64 .

Answer: D.

Pipounet · Answer

Rate 40 80 x
Time 2 3 2+3
Distance 80 240 80+240

x = 320/5 = 64

bhooshang · Answer

for sure.
I do not think this qualifies as a 600-700 question, does it?

JeffTargetTestPrep · Answer

Steve’s total distance was 2 x 40 + 3 x 80 = 80 + 240 = 320 miles.

We can now determine average speed:

Average speed = (total distance)/(total time)

Average speed = 320/5 = 64 mph

Answer: D

Abhishek009 · Answer

Avg Speed =  \frac{d_1 + d_2}{t_1 + t_2}

Or, Avg Speed =  \frac{2*40 + 3*80}{2 + 3}

Or, Avg Speed =  64 , Answer will be (D)

AkshdeepS · Answer

Avg. speed = Total distance / Total time

=  \frac{2 * 40 + 3 * 80}{2 + 3}

= \frac{320}{5}

= 64 mph

(D)

CrackverbalGMAT · Answer

Average speed = Total distance covered / Total time taken

Total time = 2 + 3 =5 hours

Distance covered in first 2 hours = Speed * Time = 2 * 40 =80miles

Distance covered in remaining 3 hours of his journey at 80 mph= 3 * 80 = 240miles

Total distance travelled = 80 + 240 =320 miles

Thus Average Speed = 320/5 (Eliminate B,C,E as they are non integer values)

Since 60 *5 =300,eliminate A and the answer is 64mph.
 (option d)

D.S
GMAT SME

Steve traveled the first 2 hours of his journey at 40 mph an

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

GMAT Problem Solving (PS) Questions

Steve traveled the first 2 hours of his journey at 40 mph an

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards