Question

A tortoise is walking in the desert. It walks at a speed of 3 meters per minute for 7.5 meters. For how many minutes does it walk?

Answer 1

The tortoise would be walking for 2.5 minutes because
3x2=6 and that would equal to two minutes and then there 1.5 meters left to walk
so if 1.5 is half of 3 than the minute would be cut in half to to leave with the answer that the tortoise took 2.5 minutes to walk 7.5 meter.

Answer 2

3 meters per minute is the rate. 

7.5/3 = how much minutes he walked. 
7.5/3 = 2.5

Answer: It walked for 2.5 minutes.