In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Manatees swim two to _ miles per hour.
[EX A]: six

[EX Q]: Lobsters have _ walking legs and two legs bearing claws.
[EX A]: eight

[EX Q]: Sound travels almost _ times faster in water than on land, and sharks have keen sense of hearing.
[EX A]:
five