Get detailed explanations to advanced GMAT questions.

A car traveling at a certain constant speed takes 2 seconds longer to travel 1 kilometer than it would take to travel 1 kilometer at 75 kilometers per hour. At what speed, in kilometers per hour, is the car traveling?

Option A:

71.5

Option B:

72

Option C:

72.5

Option D:

73

Option E:

73.5

Option B is the correct answer.

75 kilometers per hour is the same as 75 kilometers per 60 minutes….

75/60 = 5/4 = 5 kilometers every 4 minutes

This means that every 1 kilometer takes 4/5 minutes = 48 seconds

We’re then asked to add 2 seconds to this and calculate the speed. 48 + 2 = 50 seconds

To find the speed, we can use a ratio (50 seconds = 5/6 minutes):

5/6 = 60 min/X kph

Cross multiply the ratio: 5X = 360

X = 72 kph

- If a, b, c are three numbers on the number line shown above, is c between a and b.

- A clothing store’s revenue last May was 6 percent less than its revenue last April. The store’s revenue last May…

- When the even integer n is divided by 9, the remainder is 8. Which of the following, when added to n…

- If 0

- If two copying machines work simultaneously at their respective constant rates, how many copies do…

- Copyright © 2020. All Rights Reserved. Crafted by Pixelmattic