GMAT Quantitative Reasoning Practice Test 3

Question : 34 of 100

Marks: +1, -0

A car is driving at

60 {\km} {/} {\h}

for 20 minutes, and then drives at

90 {\km} {/ } {\h}

for another 40 minutes. What is the average speed of the car?

Solution:

The average speed is equal to: (Total distance)

/(

Total time

)=(60 × 1 {/ }3+90 × 2{/ } 3){/ } 1=80 {\km} {/ } {\h}

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