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OpenStudy (anonymous):
A swimmer finishes a race in 200secs with an average speed of 3ft per second. Find the average speed of the swimmer if it takes 120secs to finish the race 4ft? 5ft? 6ft? 7ft?
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OpenStudy (anonymous):
5ft/sec is the correct answer avg. speed=total distance travelled/total time taken to cover that distance therefore 3=d/200 which gives d=600ft. now we have d=600ft and t=120s to cover that distance therefore avg. speed in this case=600/120 which gives average speed=5ft/s
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