Data of Roger,
Roger runs 1 mile in 24 minutes.
So, Rate by which Roger is running = 1/24 mile/ minute.
Let, Roger runs for x minutes.
So, total distance ran by Roger = rate * time = x/24 mile.
Data of Jeff,
Jeff runs 1 mile in 21 minutes.
So, Rate by which Jeff is running = 1/21 mile/ minute.
As Jeff gives Roger a 11minute head start, so Jeff will run for (x-11) minutes.
So, total distance ran by Jeff = rate * time = (x-11)/21 mile.
Both Roger and Jeff must cover the same dist...
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