Final answer:
The ratio 90 minutes to 40 minutes can be written as the fraction 9/4 in lowest terms.
Step-by-step explanation:
To write the ratio 90 minutes to 40 minutes as a fraction in lowest terms, we need to find the greatest common divisor (GCD) of the two numbers and divide both numbers by it. In this case, the GCD of 90 and 40 is 10.
Therefore, the ratio 90 minutes to 40 minutes can be written as the fraction 9/4 in lowest terms.