In practice, the first leg of a relay takes longer to run than the others because the first runner must start the race from a still position. If the first leg of the
Jamaican team's relay took 9.72 seconds of the total time, but the other 3 legs
were all equal, what was the time for one of the later legs?
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joe is able to build one ten foot section in 5 hours, that is

he complete one, ten foot in 5 hours. so he completes one foot section in

and 120 feet long section in

bill is able to finish a ten foot section in 4 hours. therefore he completes one foot section in

so he completes 120 foot section in

so there together 1hour work is

so they complete the work in