Final answer:
To simplify the ratio 2hr 20min to 40min, convert both times to minutes, and then find the greatest common factor. The simplified ratio is 7 to 2.
Step-by-step explanation:
To simplify the ratio 2hr 20min to 40min, we need to convert both times to minutes. 2hr 20min is equal to 2 x 60 minutes + 20 minutes = 140 minutes. 40 minutes remains the same. Now, we can simplify the ratio by finding the greatest common factor of 140 and 40, which is 20. Dividing both numbers by 20 gives us 7 minutes to 2 minutes. Therefore, the simplified ratio is 7 to 2.