Walking at a constant rate of 8 kilometers per hour, Juan

BTGmoderatorDC wrote:Walking at a constant rate of 8 kilometers per hour, Juan can cross a bridge in 6 minutes. What is the length of the bridge in meters? (1 kilometer = 1000 meters)

A. 480
B. 600
C. 720
D. 750
E. 800

OA E

Source: Magoosh

Given the walking speed = 8 kilometers per hour, Juan's speed in meter per minute = 8,000 meters per 60 minutes = 800 meters in 6 minutes. Since Juan crossed the bridge in 6 minutes, the length of the bridge = 800 meters

The correct answer: E

Hope this helps!

-Jay
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BTGmoderatorDC wrote:Walking at a constant rate of 8 kilometers per hour, Juan can cross a bridge in 6 minutes. What is the length of the bridge in meters? (1 kilometer = 1000 meters)

A. 480
B. 600
C. 720
D. 750
E. 800

OA E

Source: Magoosh

Note: 6 minutes = 6/60 hours = 1/10 hours
Note: 8 kilometers = 8000 meters
So, 8 kilometers per hour = 8000 meters per hour

distance = (rate)(time)
So, distance = (8000 meters per hour)(1/10 hours)
= 800 meters

Answer: E

Cheers,
Brent

BTGmoderatorDC wrote:Walking at a constant rate of 8 kilometers per hour, Juan can cross a bridge in 6 minutes. What is the length of the bridge in meters? (1 kilometer = 1000 meters)

A. 480
B. 600
C. 720
D. 750
E. 800

OA E

Source: Magoosh

We use the formula rate x time = distance. Note that we have to convert the time of 6 minutes to hours, which is expressed as 6/60. Thus, the length of the bridge, in kilometers, is:

8 x 6/60 = 8 x 1/10 = 0.8

In meters, the length of the bridge is 0.8 x 1000 = 800.

Answer: E