An earthworm crawled toward a rock at 14 millimeters per second. At that velocity, how long

did the earthworm take to crawl 77 millimeters?

Write your answer to the tenths place.

seconds

5.5 seconds

Explanation: You can either use a proportion or simple division for this, depending on how it is requested.

Proportion

14 mm/1 sec = 77 mm/x sec [cross multiply]

14x = 77 [divide 77 by 14 to isolate the x]

x = 5.5 seconds

Simple Division

77/14 = 5.5