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SAT - Math - Time and Work

Wyatt can husk at least 12 dozen ears of corn per hour and at most 18 dozen ears of corn per hour

Wyatt can husk at least 12 dozen ears of corn per hour and at most 18 dozen ears of corn per hour. Based on this information, what is a possible amount of time, in hours, that it could take Wyatt to husk 72 dozen ears of corn?

Minimum time taken for 72 dozen ears of corn

time taken for 12 dozen ears of corn = 1 hour

time taken for 1 dozen ears of corn = 1/12 hours

time taken for 72 dozen ears of corn = 1/12 * 72 = 6 hours

Maximum  time taken for 72 dozen ears of corn

time taken for 18 dozen ears of corn = 1 hour

time taken for 1 dozen ears of corn = 1/18

time taken for 72 dozen ears of corn = 1/18 * 72 = 4 hours

thus

time taken will be between 4 and 6 hours