GMAT Quantitative Reasoning Practice Test 3

Question : 14 of 100

Marks: +1, -0

A cruise ship traveled for 3 hours. In the first hour, the ship sailed at a speed of 25 km/h, which was 25% faster than the speed in the third hour. In the middle hour the ship sailed at the average speed of the first and third hours. What was thetotal instance of the ship during the 3 hours of sailing?

$65$
$66.5$
$67.5$
$70$
$72.5$

Validate

Solution:

The distance in the first hour is

25 {\km}

.
The speed in the third hour is

25 / 1.25=20 {\km} {/} {\h}

and therefore the distance is

20 {\km}

.
The average speed is

22.2 {\km} {/} {\h}

and that is also the distance.
The total distance is

25+20+22.5=67.5 {\km}

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