Answer to question 1: in order to determine how long will Noelle and Tanya take to make 240 latkes, you use a simple rule of three, just as follow:
10/12 = x/240
10 min are required to make 12 latkes, this is equal to x time for making 240 latkes.
You solve the previous equation for x. Take into account that in this case 240 passes to multiply to the left side,
240(10/12) = x then, you make the operations
200 = x
Hence, Noelle and Tanya will take 200 min to make 240 latkes
Answer to question 2: the same as before, but now you have that the time is the searched value. First, you have to express 1 hour in minutes.
1 hour = 60 min
Next, you use the same rule of three, but now numerator is latkes and denominator is time:c
12/10 = x/60
60(12/10) = x
72 = x
Hence, 72 latkes are made in 1 hour
