Answer:
42
Explanation:
For the step, let's get an answer about how long it would take for Tina to run around the base in 10 minutes.
For this, you would just need to do: 12 ÷ 2 = 6
So, 6 runs = 10 minutes
Since 70 ÷ 10 = 7 ...
All we will have to do is 7 x 6 which would equal 42.
Therefore, Tina can run 42 circles around the base in 70 minutes.
-kiniwih426