GMAT Quantitative Reasoning Practice Test 4

Question : 64 of 100

Marks: +1, -0

A car was driving at

60 {\km} \/ {\h}

for 20 minutes, and then at

90 {\km} \/ {\h}

for another 40 minutes. What was its average speed?

Solution:

The average speed is equal to:

(\text "Total distance") {/}( \text "Total time" )= =(60 × 1 {/} 3+90 × 2 \/ 3) {/} 1=80 {\km} {/} {\h}

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