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by Layo » Wed Sep 15, 2010 9:01 pm
I have already solve this problem and would like to know your approach to this.

Oscar is running in a straight away from Nancy at the rate of 20 feet per second. Nancy is chasing Oscar at the rate of 25 feet per second. If Oscar has a 100-foot head start, how long, in seconds, will it take Nancy to catch Oscar?

A. 4
B. 5
C. 10
D. 20
E. 100
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by sanju09 » Wed Sep 15, 2010 9:12 pm
Layo wrote:I have already solve this problem and would like to know your approach to this.

Oscar is running in a straight away from Nancy at the rate of 20 feet per second. Nancy is chasing Oscar at the rate of 25 feet per second. If Oscar has a 100-foot head start, how long, in seconds, will it take Nancy to catch Oscar?

A. 4
B. 5
C. 10
D. 20
E. 100

The 100-foot head start is to be covered by Nancy with a relative speed of 25 - 20 = 5 fps in order to catch Oscar; time taken is that simple

= 100/5 = [spoiler]20 seconds.


D[/spoiler]
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