GMAT Quantitative Reasoning Practice Test 2

Question : 21 of 100

Marks: +1, -0

John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 60 miles per hour, what is

v

in miles per hour?

Validate

Solution:

Take 100 miles as the total mileage traveled, then calculate the total distance divided by the total time to receive the average speed for the whole trip:

\;{100}/{{80}/{80}+\;{20}/{v}}=60

And

v=30

miles per hour.

Go to Question:

Prev Question

Next Question